EOS Comments sought on 28-70 3.5-4.5 II

[Neil K.]

  I've read that the old 28-70 3.5-4.5 II lens, whilst suffering from 
lousy UI, (rotating end that enters the barrel) has far better 
sharpness than most other of Canon's cheap zooms.

  Can anyone out there with this lens comment on whether this 
assertion is, in fact, true? I'd be comparing it to, say, the 28-105 
3.5-4.5 I.

  - Neil K.
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