Info from dpreview : The EOS-1Ds Mark II is the sixteen (point seven) megapixel successor to the EOS-1Ds which was announced almost exactly two years earlier. Carrying on from the EOS-1Ds the Mark II has a full size 35 mm (36 x 24 mm) sensor which means it introduces no field-of-view crop, an 18 mm lens on this camera will provide exactly the same field-of-view as it would on a 35 mm film camera. At first glance it’s clear to see that Canon has stuck (as they did with the EOS-1D Mark II) with the same body and control layout. The timing of the EOS-1Ds Mark II’s announcement was interesting if not totally surprising coming just five days after Nikon announced the twelve (point four) megapixel D2X, the megapixel one-up-man-ship continues.

Despite the significant jump in resolution from the EOS-1Ds (11 mp) to the EOS-1Ds Mark II (16.7 mp) the camera maintains an impressive four frames per second shooting rate and a buffer large enough for 32 JPEG or 11 RAW images. The EOS-1Ds Mark II’s internal bus throughput of approximately 67 megapixel/sec is virtually identical to the eight megapixel EOS-1D Mark II.