My good friend Weerd Beard was kind enough to take some measurements and get the weight of his Smith & Wesson SW1911SC, a scandium framed, Commander-sized 1911 from the good folks at Smith & Wesson. I provided my Glock G30, a double-stack DAO polymer-framed subcompact. In the pictures shown for comparison, I've used my Colt 1991A1 as a stand-in for Weerd's 1911SC; the only difference size-wise is that the 1991A1 is a Government model (5" barrel), adding 3/4 of an inch to the Commander model overall.
First off, the direct comparisons:
Glock vs. 1911: Height
Glock vs. 1911: Length
Glock vs. 1911: Width
The Glock, being a subcompact model, has the advantage in length (even subtracting 3/4" for the shorter Commander size of Weerd's 1911SC) and definitively in height. The 1911 is significantly thinner than the Glock. Both guns have other sizes available; there are micro-1911s with 3" barrels and shortened grips; there's also a single-stack subcompact Glock (G36) that's substantially thinner than the double-stack.
Next, the weights:
Only 1.3 ounces separate the two guns; that's pretty surprising - I would have thought the polymer-framed Glock to be substantially lighter. Had the 1911 been an all-steel model, the weight differential would be more dramatic (of course, as my grandfather used to say, had the dog not stopped to shit he'd have caught the rabbit, so...)
Other factors up for consideration are that the Glock carries 9 or 10 rounds (9 round magazine shown, and will accept a 13 round G21 (full-size) magazine. The 13 round magazines have +2 extensions available, meaning that you can have 15 rounds of .45 ACP goodness at the ready, added to the 11 (10+1) in the gun for a max of 26 rounds. The 1911 has an 8 round magazine, with 10 round magazines available, for a max of 19 rounds.
This is pretty much the end of the objective comparison; anything else that could be included would really be more subjective. Reliability, accuracy, ease of cleaning/tinkering, aftermarket parts, accessories; all of these are open to interpretation and/or rely on assumptions. This comparison is not meant to favor one pistol over the other, but merely to provide a direct comparison of physical characteristics of the two firearms.
I'd like to thank Weerd Beard for suggesting this comparison and for providing the specs and pics of his 1911SC. Blame him if you want to get into the holy mother of all opinion wars as to which of the two guns is a better platform... *g*
That is all.