What is his technique?
Meanwhile, I came to MF with the Pentax 645N system and loved it. Then tried a Rolleiflex and it quickly took over. Yes, I had to get used to the mirror image, but ultimately find the mirror image an advantage, and the WLF a superb plus. Especially if you wear glasses, as I do: I can keep them on with my Rolleiflexes, not with my Pentax.
I loved it so much that I also acquired a Rolleiflex 6008i, which has a WLF, but with meter and interchangeable lenses. It is heavy, though, but handles quite well. It is not sharper than the Xenotar or Planar 2.8 80mm lenses on the TLR, which are indeeed wonderfully silent. I'm going to offload one TLR only because I need the dosh, and I hope to add to my 6008i, and still have a TLR, but otherwise the TLR rules. (I still use my Pentax 645N with 35mm, 135mm, and 150mm lenses. The Pentax also is ergonomically brilliant, has a built-in diopter, and a future upgrade path to the 645D... But the WLF is still my first choice.)
We have remarkably similar gear. I also have the Pentax 645 and 6008i. I have a 67II for good measure. I agree with your assessment of these types.