I have a Vivitar 28mm f2.8 Serial no. begins 22xxx which were apparently made by Komine in Japan. Bought it in 1981. Later I bought an nFD 28mm f2.8 and recently did a comparison shoot on the same body, T90, on single roll of film. Allowing for the fact that all shots were handheld the Canon only narrowly edged out the Vivitar and I will keep and use both lenses as I have several FD bodies. Different filter threads, 52mm on the Canon and 49mm on the Vivitar and I have a bunch of filters in both sizes so this may be an influence on which lens I will use in a given situation.
Regarding the FD 50mm f1.4 SSC, in its day it was a benchmark lens against which others were compared in the photographic press at the time. I still think a Nikkor 50mm f2.0 I used once was the best 50mm during the mid '70s period. Basically none of the top 5 Japanese manufacturers made a dud 50mm. I'm thinking of Canon, Nikon, Pentax, Minolta and Olympus in no particular order.
The FD 50/1.4 I have is the first version, chrome bayonet/filter ring on the front, no markings regarding coatings, so likely single-coated? One of the better fast 50s I've seen, for 1971 I can see why folks were impressed. IIRC the SMC Takumar 50/1.4 was still a couple years off.
If you mean the 50/2 Nikkor H, I agree. I have 5 pre-AI Nikon bodies, and 5 50/2 Nikkors - one AI'd & muticoated - IMO one of the very best 50/55 standards from that era. The Nikkor H is better at f:2 (wide open) than the contemporary Nikkor-S 50 1.4 at f:2, and the -H has few apologies to make to a Summicron-R - a wee bit of barrel distortion is about it.
xkaes: "And the slower 50/55mm lenses often outperformed the faster, more expensive lenses."
Yes, I have Pentax, Yashica, Mamiya Sekor f:1.8-f:2.2 lenses, they're all very good to excellent. Even Leitz remarked that the 70s 50/1.4 Summilux needed "to be stopped down for best definition".
The one problem I see with the FTb body is the shutter shades a little at 1/1000, as if the second curtain is getting a sluggish start. That's pretty damn good, for a 51 year old camera that's never been maintained. Modern synthetic watch and clock oils & greases work very well in these older mechanical cameras, as long as you first remove all the old lubricants.