Hi Vivek and K-H,
It may be spam in the sense that the e-mail arrived uninvited, but I'd consider the Kolari mod very seriously to go with TAP. I don't see how the sensor mod could possibly make any difference in the adapter's performance, but it does firm up the corners considerably with a number of lenses in the 28-50mm range. The TAP for AF and Kolari mod for corner sharpness should be two complementary ways of improving Leica-Sony image quality.
My adapter is shipping now, so I don't have experience using the combination; but I have both stock and Kolari-modified A7rIIs and have tested them carefully with a number of Leica lenses. The mod offers some real differences in corner resolution, almost always one stop and maybe two stops wider aperture for acceptable work.
It does not, I should say, rehabilitate all moderate wides, even when stopped down – the 28 Summicron, for example, still has sloppy corners at medium apertures.
But the mod improves the 35 Cron V4 noticeably at f2-4, and the 40 Cron (a fave of mine) covers very well with firm corners. Some lenses, like the compact 50 Elmar that does poorly on Sony, get a new life. And my 5cm 1.4 Nikkor becomes usable with the mod, with its characteristic low-contrast glow at f1.4-2.
What surprised me most is that I could see a bit of corner improvement with the WATE and MATE! I'd really not expected this, because they're retrofocus lenses with the rear element much farther from the sensor. Improvement was slight bit detectable at 100%.
OK, it was spam, but 'good spam' to my eye.
Kirk