I've shot a lot with the blackmagic cinema cameras, the 2.5k, 4k and I own two pocket cameras I use for documentary work.
I personally like how the camera's look. I'm absolutely not in love, nor would I consider them a replacement for film in any way shape or form. Personally, having shot and worked with MANY of the D cinema camera's, the Alexa is the only one which has fooled me. Every camera has it's issues, just like every film stock can usually be pointed out. So in the past where the stock and lenses generated the look, today the camera head's do which means people need to shoot with many different camera's to get different looks, if they want that.
Slumdog was mostly shot on film. If you watch it, you can tell what shots are digital and which one's are not, with the BluRay, it's night and day. All of the fast moving stuff in the slum's, the tv show material and mostly all of the night stuff, was digital. When you re-watch, look for motion blur… the film material won't have it. If I had the time to get my home theater up and check those shot's, I would… maybe someday in the near future.