I just thought I would post some initial thoughts on the D7100 I picked up today. I am comparing this to the D7000.
I will add to this thread as I get to know the camera.
Things I like...
Build quality seems a little nicer than the D7000 and fits nicer in my hand.
Its noticably lighter than the D7000.
The new autofocus system seems to be smarter (in AFS 3D mode) and obviously covers more area than the d7000.
The Viewfinder and rear screen info display is clearer and brighter.
High ISO performance looks fantastic up to ISO 3200.
LCD screen is brighter in daylight.
Ok button to zoom.
Things I dont Like or need to get used to...
The locking mode dial is a little fiddly.
The shutter button to be a bit vague and squishy.
The + - zoom buttons have moved slightly.
There seems to be a longer delay to activate live view and image review.
The first thing I noticed was how green the LCD screen tint is. This is not overly important in the end but it would be nice to have a more neutral tint.
AF was a bit off initially so i I AF fine tune a couple of lenses which was easy.
High ISO looks a lot better than the D7000 which is great. Below is a couple of images (Jpeg med) I shot at ISO 3200 so you can see for yourself.
I cant wait for the Adobe support for D7100 NEF to see what this camera is really capable of.
D7100 High ISO by Andrew Alderson, on Flickr
D7100 ISO 3200 by Andrew Alderson, on Flickr