I agree with the above. Your lens set should be more than fine. I have a 75mm that I use in tight canyons and on occasion for a real wide view, but got along just fine without it for years.
If you find yourself cursing your 90mm because it's not wide enough semi-regularly, then you can consider acquiring a wider lens. Until then, just go with what you have.
FWIW, 135mm seems to be my most-used focal length.
Best,
Doremus
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