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How good is it?
Much better than the 24-105 and such whether at f/2.8 or f/4 or f/10.
That said, the new 24-70 II has had people posting some pretty amazing samples at 24mm, edge to edge I think the 24 1.4 II still beats the f/2.8 samples I've seen and maybe the f/4 ones but....
The edges are messyish until f/2.8 and not 100% really great until f/3.5 or f/4, center and midframe are very good even at f/1.4, edges are pretty bad there and corners are worse but not many care about 24mm corners at f/1.4, for most shots I don't that matters at 1.4, edges usually aren't super crucial at 1.4 either.
On FF it was really the only way to get a general purpose lens (with AF) that was great edge to edge and wide. With the new 24 2.8 IS and 24-70 II that may have changed.
One of my most used lenses. 70-300L, 24 1.4 II, 300 2.8 IS and 100 macro are my most used lenses by far.