OK, here are the first preliminary results. I printed test strips at a magnification of 12 (ca. 30*40cm from 35mm). The Beutler film strip had a bit lower contrast and I compensated this by adapting the paper contrast. Not ideal, I know.
Beutler shows a bit more resolution than Rodinal and XTOL 1+1 (one step in the USAF chart). Rodinal is visibly grainier, XTOL and Beutler roughly the same. Rodinal looks slightly sharper than XTOL, Beutler maybe even a bit more but looks (due to the finer grain) cleaner.
All in all the differences in grain (except Rodinal) and sharpness are subtle and one has to examine a 30*40 print quite close to see the difference.
Rodinal had 22°C during development which is counterproductive for fine grain. Other people report that Rodinal at 16°C gives visibly finer grain but not at the level of D76 and friends.