Nikon F4s for the first time

Was at the Camera Workshop in Peninsular Plaza Singapore today fooling with 3 Nikon F4s body. Quite a nice camera to hold, with the right heft, and a nice sound made by the shutter. The serial ranges from a 21XXXX to a 24XXXX and a 25XXXX and you can basically tell what the changes are comparing the 3 different generations of the F4. Tested it out with AFS lens and its true that there is forward compatibility built into the F4 (first introduced in the late 80s).