Really? Depending on the focal length, subject distance and framing, you should be able to replicate the scene with the 17-55 lens with the same resolution. According to
this analysis of the 100 mm IS macro lens compared to
this one of the 17-55 IS lens, there should not be any issue.
The 17-55 f/2.8 IS lens is supposed to be sharp from corner to corner at all focal lengths. But Canon QC is AWFUL and you need to cherry pick a good copy. I went through 4 copies at Cathay Photo and only the last copy I tested was able to meet this requirement.
So, if you find your copy of 17-55 IS lens is not able to produce sharp corners, please send it to Canon for servicing. They'll of course first try to convince you the lens is performing within spec... Sigh...
Note to CPhotography: that will be my chief gripe against Canon. They have pretty awful QC. Some claim Nikon is much better and others say it's just as bad. I won't know 'cos I have never tested the grass on the other side of the fence.