Hang on, I'll see if I can dig up any pics comparing mine to the Kimber Compact I had, it was a 4" with a magwell on it, but it should give you a comparison.
If I can't, the barrel will be about an inch longer than your ultra carry, and the grip is about 1/4" longer. The 1911 is significantly slimmer over most of the gun, but the widest parts of the 1911 are not much narrower than the widest parts of the Sig. If your Ultra has the aluminum frame, (~25oz), then the Sig is very close to the same weight unloaded.
In short, the Sig is larger, but completely doable for an EDC, I did for a couple years.
If I can't, the barrel will be about an inch longer than your ultra carry, and the grip is about 1/4" longer. The 1911 is significantly slimmer over most of the gun, but the widest parts of the 1911 are not much narrower than the widest parts of the Sig. If your Ultra has the aluminum frame, (~25oz), then the Sig is very close to the same weight unloaded.
In short, the Sig is larger, but completely doable for an EDC, I did for a couple years.