Shooting wide open with a fast lens, I do my best to get the images to merge together, but am never certain that I hit it right. Sometimes it's right on, sometimes not. Stopped down it's not such a problem.
Well, that does argue for at least focus confirmation. However, if the gear isn't in calibration focus confirmation won't help.
So, if focusing tends to be a consistent issue, have you bench tested your camera/lenses to be sure they are in calibration?
I had a terrible time with my M8, and upon testing found the camera and over half of my lenses to be a little off. However, the combination of camera and lenses was lethal for wide open shooting. Once calibrated most, if not all, focus issues disappeared.
I think we tend to blame ourselves, where it is often the gear when dealing with Leica M stuff.
I had a 50/1.4 ASPH that went back to Germany twice before being fixed. My policy now is to bench test any new/used lens immediately, and if it's off, it goes straight back. Oddly, I tried 3 different 75/2 ASPHs (2 used ones, and one new one) and all three were off to the point of being unusable at f/2.
Also, do you need any diopter adjustment? It seems that if you aren't sure the images have converged properly, it may be that it really isn't clear. BTW, the test of this is in lower light not broad daylight.
I now use a 1.15X mag with an adjustable diopter built in ... and it helped a lot especially with anything over 35mm.
The new M9 came perfectly calibrated and so did the new lenses I got for it ... 24/1.4 ASPH, Nocti 50/0.95 ASPH, and a late model used German 75/1.4. My hit ratio is now about the same as when using an AF DSLR ... except on moving subjects at f/.095 of course
-Marc