Hmm...the F3. I bought the action finder prism for mine, then the bolt-on vertical format shutter release/ intervalometer. Next came the thread adapter (AH-3 sticks in my head??)...then the flash hotshoe adapter which fastened above the rewind crank. The MD4 drive naturally had the Nicad pack inside for extra drive speed

.....That baby nearly weighed more than my first car!
I blame the delay, so my only very recent dive into AF lenses (weirdly
following buying digi bodies!) at how good the Nikon F3 was, or more to the point how poor the F4 was in comparison. The timing for Canon I think was spot on. Canon traditionally always seemed to play second fiddle to Nikon in the Canon F1n vs Nikon F3 battle. I think the launch of Canon's Eos 1really started to show others the way....I think a time where Canon really overtook Nikon in the Professionals choice for much of the time. (Though argubly I feel Minolta had the best AF system and Olympus the best flash system back in those days)
Canon f/1.0
I recall seeing something about a f/0.95 for a rangefinder Canon, also? Can't find my Hove blue book to check??