Why would you "want to believe a 7D is rubbish"? Why would you wish ill against any product?
If you blew up Bloom's footage, it'd look just like it does now, only bigger.
I've shot some (what I consider) really, really good looking stuff on a 7D. It's capable of great results. And I've shot some trash on it too, and found it very frustrating for anything wide/deep focus. But it's $1700! You've got to cut it a lot of slack for that!
All I'm doing is pointing out exactly how these things work. It's up to you to decide whether your scenarios would work within their limitations. If you're shooting faces, they can excel. The more that you can keep out of focus, the better they'll do. The more that's in sharp focus, the more potential for negative complications from aliasing.
They are not a magic bullet. They are not Red-killers. They're not sharper than conventional video cameras. Keep that all in perspective, and use them for what they're good for, and they can do astonishingly good things at an unprecedented low price point.
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