It's a little hard to tell because everyone measures width a little differently, and the measurements are deceptive. A lot of 1911s measure as 1.2" to 1.3" thick simply because they have an ambidextrous safety or a large paddle safety, because that's the thickest point of the gun, even though the slide and frame are much slimmer. On small guns where the difference is a twentieth of an inch, it's usually the slide stop or takedown lever, which of course is an insignificant amount of the total gun footprint. On revolvers it's the cylinder width, which is usually double or more the width of most of the gun. I think to compare fairly, I'd want to know the frame width, the slide width, and the width at the widest point of the gun, and what part is the widest point of the gun.