135/2
180/3.5
600/4
50/1.8 Mk I (from 1987)
16-35/2.8, MAYBE
85/1.2 MAYBE
There's no other EF lens I ever have the least bit of excitement to use.
The 50/1.8 Mk I has the same optics the later budget 50/1.8 does, but in a pro-quality housing. Only a 5-blade aperture, though I used at 1.8 a lot so round highlights. It makes the camera just enough smaller to fit more comfortably in the backpack than the 50/1.4, and I don't typically need the extra 2/3 stop.
The 135/2 is magic--makes anyone look like they're a still from a movie. It was about the #2 sharpest black EF for a long time though I stopped paying attention to such figures 20 years ago. This (and the 600/4 and maybe 50/1.0, hmm and maybe 85/1.2) are the only lenses whose images can fill me with wonder, even though I took the photo!
The 180/3.5 was the #1 sharpest black EF for a long time.
The 16-35/2.8 never really disappointed, which is the best thing I can say for it. In contrast, ALL of the rest of the black lenses disappointed me a fair amount.
There was hardly ever a shot from say the EF 50/1.2 that DIDN'T disappoint. The 50/1.4 is no better, but at least is small, light and cheap.
The 85/1.2 MkI was the worst lens I ever owned in every dimension, except the images now and then were incredible. Too heavy, ungainly, slow-focusing, battery-eating, weird hood bayonet clamps, hard not to touch the rear element when changing lenses.
I didn't have the 35/1.4 MkII, which I hear made great images, but even with great images, I've had a Leica 35/1.4ASPH since like '97 and it's not only sharp and great images, but like 1/5 the size. So while the EF MkII images may not have been disappointing, using it would have been constantly disappointing. I had the 24/1.4 and 35/1.4 MkI, neither of which failed to disappoint.
The first three are the only EF lenses I kept once I moved to R.