There are a ton of really good Canon and Nikon lenses in LTM. I don't have my pictures well-organized by which lens I used, so there aren't dozens of examples I can show. But here's what i have, with my favorites *'ed (though all are good):
Canon: 25/3.5*, 28/2.8, 35/2.8, 50/1.2*, 50/1.5*, 50/2 collapsible, 85/1.8*
The 25/3.5 is a Biogon formula, very nice rendering, but exhibits some light fall-off as the rear element protrudes deeply.
The 50/1.2 is a special lens, with some wild bokeh wide open.
The 50/1.5 is a really good Sonnar type, with warmer colors than the Nikkors.
The 50/2 collapsible is from 1949 and quite uncommon. Kind of like a Summar, but much better coatings.
The 85/1.8 is very sharp and modern, but somewhat larger than many RF lenses.
Nikkor: 28/3.5, 35/1.8*, 35/2.5, 50/1.4* (x2), 50/2* (x2), 50/3.5 rigid, 85/2*, 105/2.5
The 35/1.8 is a great lens, sharp and good contrast, but can do swirly bokeh.
I have two of the 50/1.4 Sonnar-type lenses: An early one (s/n 5005xxxx) that is quite sharp, but low contrast and warm-ish color. A late one (s/n 380xxx) that is cooler in tone, but doesn't seem sharp on my R-D1 (maybe needs shim adjustment?)
I have early and late copies of the 50/2 Sonnar-type lens, and they're even better performers than their faster brothers, IMO.
The 50/3.5 is very nifty -- a rigid Tessar formula with close-focus capability, built so smooth and solid it's a pleasure to handle.
And the 85/2 is a sweet long Sonnar -- the earlier chrome version was too heavy for my taste, so I got a late black one instead.
I'll try to post a few pictures later.
::Ari