Hi Keith,
I've worked with all the mentioned alternatives here, F100, F5 and F6.
I've bought a brand new F6 with MB-40 vertical grip and MV-1 datareader some years ago and have shot many hundred rolls with it.
It's by far the best 35mm SLR I have ever used. Simply a dream machine.
Compared to F100 and F5 the F6 has the following advantages:
- much better ergonomics
- improved viewfinder (the best viewfinder I've ever seen on a SLR or DSLR)
- shutter is better dampened, significantly less vibration, resulting in sharper pictures at longer shutter speeds
- more precise autofocus, better AF coverage
- more precise focus with manual lenses (with my manual Nikkor and Zeiss lenses I get sharper pictures with the F6 compared to my manual Nikon bodies); F6 and Zeiss glass fits extremely well
- full compability with manual lenses, all exposure modes and matrix-metering working
- i-TTL flash system (and that is outstanding)
- built-in data back
- full exif data, either on back LCD and / or via datareader MV-1
- excellent flexibility: light-weigt and smaller without MB-40; excellent ergonomics and full power (8 fps) with vertical grip MB-40
- silent mode
- improved MLU
At that time I hesitated for a long time, also because of the price.
Since I have it I know the hesitation was wrong. I should have bought it much earlier.
The camera is worth every cent, I think it is even worht much more.
For me it is a lifetime camera: I will use it till I die.
Here are some other test reports about the camera:
http://www.nikonlinks.com/equipment_film_f_Series.htm#f6
Cheers, Jan