You asked
Leica sl typ 601 vs sony a7r?
Both are full-frame mirrorless cameras with no stabilisation in the body, so you'll want stabilised lenses for slow shutter speeds either way. The Sony a7R has the edge on resolution, at 36.4 megapixels against the 24 of the Leica SL (Typ 601). It's also the older camera, announced in 2013 rather than 2015.
The Leica's appeal is its own L-Mount lens line, which is smaller than Sony's E-mount range. If you want detail for cropping and big prints, I'd take the a7R. If you already love Leica glass, the SL is a fine body to build around. For a standard zoom on either, look at the Sony FE 24-70mm f/2.8 GM or the Leica Vario-Elmarit-SL 24-70mm f/2.8 ASPH.
Written by Claude from this site's pages.