Hi,
All I have is Minolta Rokkor 24 and 28mm f2.8, 35mm f1.8, 50mm f1.2 and f1.4, 85mm f2 and 135mm f2.8 and a Sigma 50mm macro in Minolta fit also a Tokina 70-210mm.
Olympus Zuiko 24 and 28mm f2.8, 50mm f1.4 and f1.8, 85mm f2 and 135mm f3.5.
Canon FD 28mm f2.8, 50mm f1.4 and 85mm f1.8.
I went for these as they're relatively cheap and easy to find but honestly I think that the third party options from Sigma and the like in any of these mounts are worth looking at if you find a bargain. For example I've seen the Camera manufacturers branded 24mm lenses going for around the £100 mark but third party lenses going for £20-30.
All of the lenses I have are acceptable for whole images but not up to competing with a good quality modern lens. Where there's a difference the Rokkors are the best when it comes to sharpness and lack of blooming/CA etc. The differences with the lenses I have are with the 24, 50 f1.4 and 85mm lenses and in each case the Rokkors are the best. The Oly lenses are good and the 24 and 28mm f2.8's and 50mm f1.8 are very compact and very attractive for that. I'd say that the FD's I have are between the Rokkors and Zuikos for optical quality.
Any of these would be fine for me and the only real differences are with the 50 f1.4 and 85mm lenses at their widest apertures. Actually my favourite at the moment is the Rokkor 50mm f1.2 which I initially wrote off as rubbish but I've come to like it not because it's a technically good lens as I think it's technically quite poor but I just like the look it gives
If you've set your heart on FD's I can recommend the only ones I've tried which are the 28mm f2.8, 50mm f1.4 and 85mm f1.8. They are IMO good enough
The likes of Zeiss may be better but no doubt more expensive and if I was going to spend more than the mass market Rokkors, Zuikos and FDs cost I think I'd look at the Voigtlanders as I think they look lovely.
And a PS just in case it matters.
I think these old lenses do well on my A7 especially in the centre of the frame and they can actually be so sharp I find it hard to believe they old film era lenses
However, mount them on something with a smaller sensor like my Panasonic MFT cameras and they don't shine quite so much as they have to work just that little bit harder.