I returned my first sample after talking with Thypoch. They said it was in the range for their norms but asked me to send them back (I gave it to their representative at the Paris photo show) and managed for my reseller to send me a new one.
They have been very nice, helpful and incredibly reactive.
This one is exactly like Fred described: as good as the Ultra in the center (even better) with field curvature.
All in all, an excellent lens that will become my main 35mm because it is smaller than the 35mm/1.5 Voigt and has a nicer bokeh than the Ultron.
A few ergonomics details are not perfect (would prefer a matt finish, focusing ring a bit too hard, diaphragm ring a bit too soft, screw in the middle of the 6 bits coding space, engraving should be more white, no mounting dot) but this is not a deal-breaker and I can fix the last 2 or 3 (and did).
