>>3624217Find an old 28-70 Canon kit lens from the 1980s that came with the EOS 650 and 620 cameras. They are renowned for their optics and their MTF charts are only bested by L lenses, and not by much, as long as you don't mind noisy AF.
The 50 STM is a good lens too, basically a Nifty Fifty with better coatings but the optics are from the FD mount era, if it ain't broke don't fix it.
The 28-200 you have is a decent walkaround that needs to be stopped down to at least F/8 for passable images. You'll like it though, I had one. Amongst all of the baller Nikon glass in my arsenal, in my bag next to my 50mm f1.2 AI-s, is a Quantaray 28-300 that I use for walkarounds, at F/8 it's alright just needs good light and a little post to make it shine.
The 70-210 F4, the Poor Man's L, is also a decent lens, and harks from the same era as that 28-70. My old Canon setup was a 5D Classic, before I went to Nikon. I started out with L lenses and sold them all when I found out I could get 99% of the performance of my 24-105L and 70-200 f4L IS from that 28-70 kit lens and the 70-210 f4. If you don't need stabilization and want an outstanding setup for not outstanding amounts of cash that is the poor man's setup and f you are careful you can find all 3 attached to an "old 35mm Canon camera" for sale on Craigslist or FB Marketplace for 50 dollars.