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With the 600D, D5100 and the a77, then lens you use would make a far more noticeable difference than the body if you're only doing landscapes - the a77 is arguably better for video and sports/action photography where the subject moves quickly. If you plan on doing large prints, the a77's higher pixel count does give it an advantage. You're best out trying all three to determine which is more comfortable - that one will probably be the one you use the most.
Is there a particular reason why you didn't mention the Canon 7D or the Nikon D7000, which are closer matches to the a77 in terms of feature set and price?
With photography, "better" is often subjective. The NEX7 can take great pictures in the hands of a skilled photographer but lousy to unremarkable ones in the hands of a ham-fisted photographer without a modicum of creativity.
_________________ Bodies: Canon EOS 550D w/ Magic Lantern Lenses: Tokina AT-X 116 Pro DX f/2.8, Canon EF-S 15-85mm f/3.5-5.6 IS USM, Canon EF-S 18-55mm f/3.5-5.6 IS, Canon EF 50mm f/1.8 II, Canon EF 70-300mm f/4-5.6 IS USM Accessories: YongNuo Speedlite YN-468 Flash, Neewer Macro LED Ring Light, Meike Battery Grip, YongNuo RF-602 Wireless Flash Trigger & Receiver YongNuo WR-128 Wireless Remote Control

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