Does the kit lens do more general purpose stuff than the others? Also how is it in low light?
I don't have these zoom kit lenses. Only the 30 mm and the 50-200mm lenses.
But Samsung seem to have stopped all their lenses at 0.2 magnification. The sensor is 23.4 x 15.6mm. And the smallest item that fills the whole frame will be about 117x78mm (about 4x3 inches). If you want closer you have to crop the photo. The up coming 60mm lens is expected to have magnification 1:1. Then the smallest item that fills the frame will be 23.4 x 15.6mm.
The 20-50 mm lens will be a good lens to take photos of the family, the environment as we humans are in. It won't be able to take close up of a tiger at the zoo, but the tiger with his environment. You will no be able to take a close up of the pigeon on the roof but the roof with the pigeon. Nor will it take a close up of a beetle, but the leaf with the beetle.
It is a good all-round lens, but does not go nowhere near the extreme at all. It tries to focus to be sharp in the range as it is made for.
I bought Samsung nx10 because I liked the size and how I would control apertures etc. I like it much better that the Canon cameras I have had. But the Samsung lenses cannot beat my Canon L lenses as cost around $2000 each. The second reason I bought the NX10 was for the 30 mm lens. It is very good and not that far from the expensive Canon lenses in sharpness. It is significant better than Samsungs zoom lenses. The 30mm lens is very good for night time photography with its large aperture - and no zoom no matter brand can compete with the lens.
A nice feature is when you turn on manual focusing. When you focus the lens with the outer ring, you screen will enlarge the center, so you can focus easier. This is way better than most dslr do.
I believe the Samsung NX10 and NX100 with a 30mm lens is a very good learning tool to learn how to get in control of the camera to get the photos you want, but mean to step by step stop using auto programs and focusing. I believe it is better learning tool than Nikon and Canon.
Maybe it will not make your Fuji camera obsolete, but complement it. The Samsung cameras are cheaper than the competing brands. And if you find it too complicated you have limited your loss. If you find it to limited you will hopefully be able to buy the lens you want. Samsungs line of lenses is for the moment very limited (only Sony NEX has less lenses available), but the unofficial road map for coming lenses looks promising.
The market leaders in the mirrorless system cameras is Olympus and Panasonic. Their sensor is slightly smaller, but the difference today is not big. They have more lenses today, and some of these lenses are good, but many not. When I looked at them I did not find them as easy to use as the NX10.
New to the market is Sony NEX. They have the same size of the sensor as the Samsung. The Sony sensor is the best of them all, no question about it. But they have not design the cameras for those as want to learn photography, but for point and shoot users. I believe their name and the small size of the camera has attracted more users than the Samsung cameras. But the user interface in the current cameras is jut a pain and will warn you, you will not develop as a photographer. At the moment they have no good lenses that can meet the quality of their sensor or compete with Samsungs lenses, but might change in the future. I have not looked at their road map.
Sony has another serie of cameras with the alpha mount. Some of the entry level of these cameras has the features of both dslr and mirrorless cameras. When I looked at it two months ago, they lacked the zooming in feature as I mentioned above, but will most likely come in future models. To these lens mount there are lots of lenses and they can compete with Canon and Nikon lenses. They are lacking the 30mm lens, as make the Samsung good for evening and indoor photography.
So still I believe the Samsung is the best compromise for the moment, and especially if they come with the lenses as is on the road map and they are at least in the quality as the current lenses or better. But in the end it is depending on what kind of photography you want to do, if you are prepared to wait for more lenses or not, if you are prepared to buy more lenses at all, if you are prepared to carry several lenses with their increase of weight.
The difference of sensors on the system cameras are not that big, and the standard lenses are often that far from each other, all of the producers has a gem lens or two and it is not obvious which lens it is, for Samsung it is mainly the 30 mm lens. Panasonic has a similar lens as is also popular, but the Olympus similar lens is not close in sharpness, but they have just released a 12mm as looks like their gem lens.
I sometimes divide the dslrs users into two different groups. One as want to make good photos but only use auto modes and does not buy any more lenses than the kit lens, and they might be better of with a Samsung EX1 or Panasonic LX5. The other group is buying lens after lens, to get sharper and sharper lens, and more specialized lenses. Which one do you belong to? Can you afford to be long to the second group? Do you have many other hobbies so you can not work the photos often? These are questions as you have to ask yourself.