I'm no professional either (closer to amateur / hack, really) but if I were going to plunk down $7500+ for a SL Typ 601 Leica body for pro work, I would probably seriously consider moving upscale and just buy a Leica S-E Typ 006. It's a difference of $3-4K but you'd be getting a medium-format system with a decent readily-available range of lenses to boot.
Of course, the SL has the advantage of using 'heritage' or 'vintage' glass (R and M lenses) through soon-to-arrive adapters.
Random thought: if the SL Type 601 has a newly-designed 24MP sensor, could / would Leica do a refresh of the M-body and put the newer 24MP sensor in the M-body? THAT would make me sit up and take notice. I don't need 4K video or GPS etc., but the insertion of the new sensor in a M-mount body would be cause for celebration.