Lars, for over $1800 for a prime lens in this recession, I think I deserve at least the right to complain if it isn't close to perfect. But my experience is just one input, one data point in the gaussian distribution. Don't get me wrong, I love the color out of this lens. If I didn't like Zeiss, I wouldn't be getting another one.
Cartenw, I tried focusing in the front slightly and still got about the same result. I may be guilty of pixel peeping. I think they're pretty close and for real world purposes you wouldn't be able to tell the difference. When I say sharpness is lower, I should say very very slightly lower. The difference is almost negligible. Maybe it's not even lower but just a different look (slightly softer, glossier look).