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The Sony Alpha mount is the Minolta Maxxum mount, which won't accept the old MC/MD lenses without a conversion, so I don't think he was using the M42s on Sony with those adapters. Maybe he had an old Minolta film camera that accepted the MD mount? It is entirely possible to use M42s on Sony SLR/SLTs (or the NEXs), but a different adapter would be necessary.
The Komura is an interesting lens, as previously noted. Yoyo Yang has a nice set taken with the lens and a 5D on Flickr.