So far, so good on my MKIII, or at least I haven't NOTICED any. I don't think there is a sensor made with 100% "working" pixels, you just don't notice them or the camera/software "hides" them/re-maps the sensor. Both of my MKII's have hot pixels. My first one(12/08) was REALLY bad. I showed CPS some RAW files and they told me to send it in and I got it taken care of under warranty. There are hot/stuck pixels again, but I've just lived with it and fixed it in post when they've shown up. I don't shoot video with mine, but when you do flip it over, there is a big white, lit pixel cluster that makes it unusable in video mode. My second MKII body(10/11) has some, too and I'll probably send it in pretty soon and get it taken care of under warranty. It's funny, the sub-$1k 60D I bought my GF has been rock solid, so far and both of my $2k+ MKII's purchased three years apart both have pixel issues. But I've seen it happen all too often on $50K and $100K HD cameras, too.