The new LCD screen is gorgeous. 3" diagonal with 900,000+ pixels. It's possibly the best quality LCD screen ever put on a DSLR. The menus are easier to understand and navigate than the 1DS Mk2's menus. "Live View" is an excellent way to do critical focusing. If you've never used a DSLR with live view, you'll love it. The only negative of live-view is that it really drains your battery and it can only be used for a certain length of time before the CMOS imager circuitry heats up, adding noise to the image. (In real-life typical shooting, overheating is not a problem and besides the camera will auto cancel live-view if it senses an over temperature condition.)
The huge 21 mega-pixel RAW images are excellent. The camera uses an updated variant on Canon's .CR2 RAW format so if you use an older version of Adobe's Lightroom or Photoshop for image processing, you'll need the latest Lightroom 2.2 or Photoshop CS4 to get the proper RAW converter. I've personally never liked the included software for RAW image processing, but many people are happy with it.The auto-exposure system seems very accurate... more accurate than my 1DS Mk2.
I never experienced any "black dot" phenomenon. But I've only shot RAW images at less than 1200 ASA. The "black dot" sample images that I've seen on the internet look like simple, in-camera, over-enhancement of highlights. Besides, unless you're shooting sports at night or are part of a CSI team, who shoots at 3200+ ASA anyway? If you're doing a night shot of a city use a tripod, a longer exposure, and a lower ASA. This will yield rich, clean blacks and much higher detail in highlights. Also, although JPEG's are much smaller, every professional photographer that I know shoots only RAW images.
I ordered the camera with the optional BG-E6 battery grip. This grip makes the camera taller and easier to hold. It allows simultaneous use of 2 Canon lithium batteries or 6- AA alkaline or rechargeables. It's a very valuable accessory to consider.
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