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Phil, this is a starfield comparison where I took the top left hand corners from both lenses and enlarged 300%. The 17-70 was set at 65mm FL @ f4.5 and made with a standard 350D rescaled to match the 300D. The 50 1.8 is at f4 with a modded 300D. From using both lens quite a bit and from this test the 50 1.8 is definitely sharper corner to corner at the same apertures than the 17-70, but the zoom is still very good.
BTW 17-70 f4.5 image is on the left.
Terry
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