Coldkennels
Barnack-toting Brit.
Honestly, as a life-long glasses wearer, I've always preferred the IIIf over the M series Leicas; yes, the 50mm viewfinder is a squinty peep-hole, but at least I can see all of it without issue, and don't have to move my eye all over the place to see the full frame. The high magnification (1.5x) rangefinder of the later III-series Barnacks is also easier for me to focus than any combined VF/RF I've tried, and there's so many different external VFs out there that I don't have to feel frustrated. If I don't like the VF, I just use another.
Personally, I use the VIOOH for 35mm (round corners be damned), the Voigtlander 28/35 mini-finder for 28mm (the 35mm lines seem to disappear too easily to be reliable for me, but it works in a pinch if I just want the most compact kit), the collapsible SGVOO for 90mm (as it folds into a tiny package but pops up to produce a perfect 1:1 frameline for 90mm with an accurate parallax compensation dial), and the included viewfinder for Voigtlander's 15mm Super Wide Heliar (which always seems brighter and clearer than real life somehow).
I also just accidentally picked up a pre-war Zeiss 28mm finder (it was sold as a 35mm one) which, after cleaning, makes for a beautiful way of shooting 28mm. Unfortunately it doesn't quite sit right in a Leica accessory shoe due to the way Leitz chamfered one corner, so I'm considering modifying the foot to match the Leitz accessory shoe to make it work.
All of this might mean more stuff to buy/carry/swap over, but having played with M2s, M4s and M6s, I've never had much luck with the wide-angle framelines, so I'd rather have the smaller body and an accessory finder than deal with the larger M body and have to use accessory finders anyway.
Personally, I use the VIOOH for 35mm (round corners be damned), the Voigtlander 28/35 mini-finder for 28mm (the 35mm lines seem to disappear too easily to be reliable for me, but it works in a pinch if I just want the most compact kit), the collapsible SGVOO for 90mm (as it folds into a tiny package but pops up to produce a perfect 1:1 frameline for 90mm with an accurate parallax compensation dial), and the included viewfinder for Voigtlander's 15mm Super Wide Heliar (which always seems brighter and clearer than real life somehow).
I also just accidentally picked up a pre-war Zeiss 28mm finder (it was sold as a 35mm one) which, after cleaning, makes for a beautiful way of shooting 28mm. Unfortunately it doesn't quite sit right in a Leica accessory shoe due to the way Leitz chamfered one corner, so I'm considering modifying the foot to match the Leitz accessory shoe to make it work.
All of this might mean more stuff to buy/carry/swap over, but having played with M2s, M4s and M6s, I've never had much luck with the wide-angle framelines, so I'd rather have the smaller body and an accessory finder than deal with the larger M body and have to use accessory finders anyway.