Have you tried the 50/1.2 or the 135/2.0?I only ever had one Canon lense that I liked and that was the 300 2.8. I just don't like the way that they draw - all primaries, no subtlety, but that's just me.
In the end I mentioned Canon because IMO the Canon 24-70/2.8II is one of the best if not the best current standard Zoom. IMO it is better than the Nikon counterpart specially at the wide end, and I even go so far that I prefer it over the Sony/Zeis 24-70 because the Canon is sharp as well but has a smoother bokeh. But for sure everybody has his own taste which is good. During the same time when many people switched to Nikon because of the D800 I switched from Nikon to Canon because of the 5dIII (main reasons were speed of the camera and color) and some lenses. (I usually only take the DSLR when I need Zoom, fast AF or Tele)
Now if EVF and manual focus and going back and forth between magnification and framing and a somewhat front heavy combo dont bother you and if 28mm is wide enough I am sure that the combo of the 28-90 on an M type 240 is able to deliver excellent results. Maybe also the M with the additional grip would make this combo weight balanced. I just remember that I found even the Noctilux to be the limit of lens size/weight I would want on a Leica M.
I allways liked and like the M primes, I can see however how sometimes the convenience of a zoom is very nice. I experience this with the X-VArio for example. I often use it preselecting a focal length before I bring the camera to my face.
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