I’ve used Nikon dx bodies for travel since the d40x, through the d5xxx series, and now the second d5500. Through the d5100, the 16-85 gave wonderful results, very good at any price range, truly spectacular in its class - but I’m certainly willing to allow for the possibility that I have a very good copy. It was the only dx lens I owned, as my Nikon glass purchases began with film, and I’ve had ff bodies since their first arrival.
When the 16-80 first came out, I purchased one at full retail from B&H, and have never regretted it, and have never used the 16-85 since. I still have the 16-85, as I can’t quite part with it for all the wonderful travel pics it has taken, but after extensive comparisons between the two, particularly on 24mp sensors, just believe the 16-80 is better in every way. I tried a couple of more times to compare the two, and just couldn’t get past the image quality difference to reuse the 16-85. I went back and compared the two on earlier, less dense dx sensor bodies, and the results still favored the newer model.- and I’m a guy who loved the 16-85...
Thanks for the comparison between 16-80 and 16-85, that so far is the only missing info between the Nikon lenses discussed. Sounds like I can stick to the plan of getting the 16-80 when I have a chance, it's a recent lens so it should work with the new sensor well. Except VR will still be useless with the D5500 :-(
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At the risk of alienating a reader, I never have understood the attraction of going to Fuji dx from Nikon. The cameras are larger/heavier than the 3/5xxx series, and lens about the same size, and one adds a totally diferent user interface. I certainly understand why someone would initially purchase Fuji as they are wonderful products with a unique jpeg rendering, but don’t understand why existing Nikon user, particularly anyone shooting raw, would hope to gain fron adding Fuji gear to a relatively current Nikon smaller dx body. I’m a simple guy though, and the reason(s) are likely obvious.
No worries, the fact that I'm still trying to make use of my D5500 means that I'm not totally a traitor, yet
Shooting Nikon DSLRs for the last 8 years, I've never thought of getting a mirrorless. The slow/laggy and battery-eating EVF has always been an obvious downside comparing to the OVF. The main reason I started looking was because of the mirror noise of the D5500, and it's way noisier than my old D5100, so annoying in conference rooms. I did a lot of reading and research for about 2 months, comparing different mirrorless, went to Best Buy several times to handle them and listen to the shutter noise (can't remember either Olympus or Panasonic has the quietest shutter, definitely not the Fuji). Also downloaded the sample RAW files from review sites, tinkered around in Darktable, and inspected them all closely. When I settled for the X-T20, it wasn't a lightly-made decision since the camera with XF18-55 was more than double the price of my refurbished D5500.
At first I thought the X-T20 would just be my secondary camera, I tried to change the settings and adapt to its limitation (EVF set to always-on, auto switch-off after 30 seconds, buying two extra batteries, ...). The real turning point was once I saw the photos I took being clearly better than from the D5500 (with my same crappy skills). Not sure if it's the sensor, the lens, or both, but overall better color, sharpness, and high-ISO noise.
Here're some quick shots that I just did of my living room. They're not adjusted anyway in Darktable, just applied the same denoise combo for both RAF and NEF. They're all shot with no exposure compensation, just tried to match up the same apertures and ISO (all handheld with VR on, except the 35prime on tripod). I think the differences are quite obvious.

D5500 - 35 prime @ 35mm - on tripod

D5500 - 18-140 @ 18mm - VR on

X-T20 - 18-55 @ 18mm - VR on

X-T20 - 18-55 @ 35mm - VR on
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For what it’s worth, I have played with the 16-80 on my ff bodies and they hold up very well within their circle of coverage.
At any rate, my recommendation would be to buy the excellent 16-80 lens, sell the rest, and simplify your life. BTW, Nikon ff afs glass (including primes to 1.4) works well on the d5500; if you have an opportunity to purchase good quality ff glass at very reasonable prices, and the size/weight is not an issue, you won’t be disappointed.
good luck!
So, obviously at this point, I'm keeping the D5500 as secondary since I somehow enjoy the X-T20 very much although it's not any lighter or smaller. I'm not trying to list out why one is better over the other, it's a never ending debate and I'm still in love with Nikon (at least their sensors are still way better than Canon). Speaking of which, perhaps one of the reasons I like the X-T20 is because of my beloved very first SLR, the Canon AE1-P

(hey, at least I took this photo using the D5500)
