The large full-frame 35mm sensor combined with the potential of the Magic Lantern 14bit RAW video to CF-cards along with a clean image are the main reasons that the Canon 5D Mark 3 is so popular for cameras in its price range. If you want an alternative to that camera, try the Sony A7S, it has very good dynamic range in SLog2 mode along with a large sensor and high-ISO performance for astounding low-light (almost no-light) performance.
Now if you want to keep your nice smooth, steady, lightweight zoom range and all the handy features that make camcorders so easy to use, then a DSLR is going to be your worst nightmare! Finding fast parfocal lenses build for large sensors at low prices is almost impossible.
As they say there is no perfect camera for everyone!