http://www.dpreview.com/previews/can...rkii/page3.asp
21.1 megapixel full frame CMOS sensor
The EOS 5D Mark II delivers an 8.3 megapixel jump in pixel count from the original 5D. This new sensor is said to be
based on that of the EOS-1Ds Mark III (indeed it has exactly the same pixel count) but has several small changes, the hint being that it's actually slightly better.
Reduced micro lens gap
Canon have stated that the gap between microlenses has been reduced compared to the original EOS 5D, although there is still some gap (
the EOS 50D has a 'gapless' design). We are guessing that the gap has been maintained to enable a shifted pattern near the corners of the frame (which helps reduce fall-off on such large sensors).
у полтинника, между икролинзами нет расстояния никакого, а тут оно есть!
http://www.dpreview.com/previews/canoneos50d/page3.asp
по поводу пропускания линзами больше света, непомню где прочитал.. не могу найти... :\