long ago, I was told - repeatedly - that I could go anywhere, anytime with a 35mm & 85mm lens on a 35mm system. I currently have the old, non-L primes: the ancient 35mm f2 (non IS) and the 85mm f1.8. Knowing that "better" glass is available for both of these, I'm still happy with the images these produce.
I have never regretted this pairing.
While I could list numerous ops where this combo would be futile, if I found myself so engaged, I have little doubt that I'd find some use for this 35/85 combo
- 'though perhaps not as expected.
I struggle to appreciate the available 50mm offerings from or for Canon. While I wouldn't mind extensively testing an Otus, say for the next 10 years - thank you zeiss, I expect to upgrade my 35mm glass before upgrading my present 50mm f1.8 MkI.
But I have recently discovered that the 50mm f1.8 Mk I with a 1.4x TC makes a somewhat respectable 70mm f2.5 portrait lens on a full frame. While I haven't really tested this yet, perhaps there's some use yet?
also - while I've heard good things about Canon's mini micro 50mm f2 +/- its LS adapter, this is another lens that I've yet to use. I'm happy with my 100L & 180L macros.
good luck with the 50s.