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The lens is pretty big for a 50mm f1.4 prime. It's virtually identical in both size and weight to a 17-40L.
It's about 50% longer than either the preceding Sigma lens (or the 50L), but it's also a little lighter, and with the same 77mm filter thread. It shouldn't be much of a change if the balance isn't out of whack, and the ergonomics look to be a little better with the larger focus ring that's positioned further away from the lens mount.