With K-3III, All Metz 58AF2 functions, All 26AF2, All 360FGZ and All 540 FGZ work. AF160Ring seems fine as well (with usual limiting parameters).
I'm still "lost" in all of the touch screen customization, took days to set it up...
Only complaint so far... The "Named" u1-u5 functions the names don't show up on the monitor, LCD, or Viewfinder, hence I still have to remember each one. Old age sucks. Time for Ginko root...
If I've missed something on this, please feel free to give me a nudge...
Lenses: Marco 100 WR is incredible, 11-18 is great, 16-85 will hold on till 16-50 comes out, 300F4 is outstanding. Bosses' Siggy 150-500 DGOS is AOK (prior idiosyncrasies aside), Her 18-270 walk-around is AOK (convenient, but it is what it is
)
Hand Strap lug in the battery grip lakes herringbone easier, no plate until tripod needed.
I really wanted to find a few more irritants, so far? Nada...