(I haven't proofed this so I apologize for my grammar and sentence structure I think and write a little odd)
So I thought I'd give a practical opinion of the NX20 in the wild, after using it for the last 10 months. As I have no loyalty to Samsung Cameras (they haven't earned it, yet.) I don't feel the need to sugar coat it, I also have no need to rage quit... now.
First as I'm long winded the summary, I almost regret buying because of the current lens selection, and could have picked up a used D90, D7000 or 50D for the same price. However I do like it over all, I enjoy shooting with it 90% of the time, and the other 10% really even a 5DMkIII might annoyed me. For a Hobbyist Photographer like me it is a great little camera so long as you are willing to work with the system.
So the long version. I've had the camera for the last 10 months I upgraded from the NX11 which I traded in as I had only had that a year (the low light performance made me happy). I shoot with 2 lens, the current 18-55(III) and the early 50-200(I). I generally shoot Landscape, some Portraits, Photowalk, and outdoor events. I am a Hobbyist not a professional or even semi-professional and so I take it from that point of few. If you want to see some of my photos relliott.ca all photos are with either the NX20 or the NX11. I have made prints but most of my stuff is web based the largest Print was a 10x30 (requested) and a 8x16 (2:1 Crop) for my self.
Lets start with what I like.
I find from re-world comparisons with other photographers of similar and great skills the NX20 will preform about as well in most situations functionally as the Nikon D90 and the sensor will preform on par with anything I've shot with short of a Full Frame. (again this isn't pixel counting or nerding out).
The one time the camera failed to perform short of a glitch. Was at a party where I tried to shoot some fashion types and the lack of a fast zoom meant I was shooting at ISO4000. Images were web usable but not printable. But still at 55mm F5.6 at ISO 4000 being able to have a semi workable image at all is neat. Beyond that I have no complaints with the general performance of the camera in single shot shooting. There are some with Burst shooting and I'll get there.
The images in RAW are easy to work with in Lightroom, and I have no issues cropping down when I need to get a tight shoot that the 200mm can't quite get.
My favourite element is the weight, I strap my camera to my wrist and keep it in hand when I'm shooting. At an event in October I walked and jogged over an 11km march with a column War of 1812 Re-Enactors. (500m long column) I started before they got up, at 5:30am and didn't shoulder my camera until after noon hour. The 50-200 was on most of the day, I did not even feel the weight, my shoes were heavier on my feel then the camera in my hand.
I've used the Camera with high speed sink to a flash (just starting out), I've triggered strobes with it, and used various studio equipment while playing (just starting to learn lighting) I have yet to find something I can't do with the camera that I'd like to. (Minus time lapse and wired tethering)
The Swivel screen for me is killer feature, I have several time used it to get angles I would be hard pressed to get without it, including a shot of a Bicyclist on a busy Toronto Street. Flipped it down stuck the camera to the ground focused and fired. Got it first go.
It is also nice to be able to convert a RAW to JPG quickly and to some quick edits from an event on my iPad to send online with the WiFi features, or even use live view to take a group shot without worrying about a timer. (More in the bad)
My favourite feature is Direct Manual Focus, in that even my 50-200mm can have it's focus adjusted manually after I've auto focused if I choose. With the new Kit 18-55 you can focus in manually up to 7inches at 55mm which will let you to a little bit of light macro work.
In burst mode in RAW you are looking at 1 second at 8fps and about 2.2 seconds at 3fps and about 18-20 seconds for the buffer to clear. Having 8FPS is a bonus the buffer well more in the bad.
Ok so the Bad.
Lets start with the little things. This is stuff that is Mirrorless specific more then NX but the battery life is not great when you are out with DSLR shooters and at the end of the day you are into your third battery and they aren't even finished their first. However that is generally true of any Mirrorless camera. 3 Batteries are a must, and I do keep three with me if I'm doing a full days shooting.
The Contrast Focus like all contrast focus does very poorly in extreme contrast situations, be it everyone in white, on a blown out sky, or a dark room. DMF does help with this though.
Out of the box the firmware (at least for me) was horrible, and left the camera unusable but recent firmware has made it much better.
The buffer is tiny, the buffer should be twice the size it is, but I can live with it, I just don't like it. What does annoy the crap out of me and is likely the worse issue with the camera is that live view turns off when shooting buffered. Let me say this again you have no live view on a camera with no optical viewfinder after the first shutter click in burst mode. That means you are literally shooting blind while tracking. In a Studio setting shooting falling fruit or splashing of water this isn't an issue, at a Drag race... I didn't get a single usable image I was shooting blind.
There are a few other quarks I've found, in that I find the camera locks up regularly... as in take the battery out to reset it locks up. It happens at least once a week if I'm shooting heavy. Last summer it was so bad that while shooting an Equestrian event I lost almost a whole card. The Camera over heated, and killed the card. It was only about room temperature outside, but I was shooting a 15 minute performance and took about 150-200 images (lots of burst panning) The camera locked up at the key moment in the performance and I was only able to recover about 50 images from the day.
That only happened once but that is a horrible situation and left me despondent as I had gotten special permission to be where I was.
In conclusionthough, the camera is generally very usable, very enjoyable camera to shoot and learn with. I choose it over the OM-D EM-5 which was just too small in my hands, and I like the form factor better then the NEX cameras. If Samsung keeps supporting the NX system with more balanced lens (like event lens' please ) I could happily be a Samsung shooter. My only two major complaints is burst performance, and the lens selection. If Samsung fixes the live view problem in burst shooting then I'd be tickled, and if they produce a WiFi mode that will send RAW images to the computer while shooting then this could honestly compete with crop DSLRs in Studio shooting.