Originally posted by RobA_Oz Carl Zeiss and Voigtlander lenses are widely used on Leicas. The non-plastic Pentax lenses are just as well built and finished as those, and the Leitz lenses as well, so I really doubt there's that much snobbery associated with most Leica owners. Many Leitz lenses go for not much more than Pentax money, too – it's mostly the exotic ones that command high prices on the secondhand market, and they're exotic because they perform well, not just because they bear the magic name.
Even Canon or Zorki copies of Leitz lenses find their way onto Leica bodies, so we shouldn't stereotype their owners. Heaven knows, we get enough of that, ourselves, from Canon and Nikon owners!
I would say that the RF lenses mostly feels more compact and solid over Pentax lenses.
The RF system requires tighter tolerances since it's not a WYSIWYG over a prism based focus system.
Leica is certainly more expensive.
A Summicron R 50/2 easily sells for $350 used. (Bargain condition)
That's the price of most brands 50/1.4.
An m mount RF version is usually at least $100 more.
As more them being better.
Mixed..
Think of it as an arms race.
The Germans were smart, but the Japs were not dummies.
So one brand comes out with a good lens, a few years later, another comes with something as good if not better.
I briefly bought a m mount summicron 50 DR.
Did not find it better than a A50/1.7 except for a more rounded aperture.
Old coatings and more natural color, more fine sharpness over apparent sharpness.
These did not appeal to me for that sort of price (about $5xx)
There are gems in their line of course.
High tolerances, QC, customer service and good resale value too.
I just rather not deal with the stress of paying good money and worry over the thing coming to me with hazing or separation (common enough)