The very early Springfields were very close to GI specs in all regards. As Springfielld became more popular, their guns started taking a life of their own, and soon about as close as they came was the general 1911 look.
Even their WWII series, which you would think would be close, has frames that vary quite a bit, even in the same serial number range. The difference in the frames is enough that two guns often will not fit in the same kydex holster due to it, and can be very tight between them in a leather holster. You can pretty much instantly feel the difference in the grip also, especially if your used to a Colt or GI gun.
This isnt the greatest pic, but you should be able to still see the differences. The top two are Springfield WWII guns, the bottom, a Colt Series 70. If you look at the Colts grip, the front strap radius comes around to the edge of the grip panel. That is the correct spec. The Springfields are different form the Colt, as well as being different from each other. The middle one being the worse of the two. The feel between all three is instantly noticeable.
If you also look at the dust covers, you'll see the one in the middle is very blocky, with very little radius cut on it. The upper one is closer to the Colt.
One thing you cant see by looking is slide to frame fit. This to can vary quite a bit with the different Springfields.
Closer look at the Springfields
Better look at a Colt (Series 80)
The Springfields frames vary across their entire line too. This is a Loaded model. It was a very tight fit in leather holsters I used for my Colts, tight enough that it was very difficult to get the gun out during a draw, and the kydex holsters had to be readjusted open, just to get it to go in. The grip was also very wide front to rear.
Kimbers frames are very close to Colt, if not right on.