Not quite, but they should be very similar (I haven't tried a D90 personally yet, but I own a D80). The D90 has a 96 % coverage vs. the D80's 95 %, the other specs (eyepoint: 19.5 mm, magnification 0.94x) are identical. In both cases, it's a huge jump from the D40x. I've sold a D70 after two weeks, because the D80's viewfinder was just that much larger.Does the D80 have the same viewfinder as the D90?
The Fuji shares the viewfinder with the D200 which is essentially the same as the D80's viewfinder. Again, that's not a bad thing.
Yes, the new Tokina lenses have a simple clutch mechanism: you pull back the focus ring and you are in MF. To engage AF again, you have to push it forward. As mentioned by others, AF is not as critical with wide-angle lenses. Plus, if you replace your D40x (which will become your backup body, I presume?), most of the time you will be working with a camera that has a built-in focus motor anyway.I am just thinking with a Tokina lense it will not auto focus on my camera but would on a D80 and I can then "tweak" the focus manually from there.