I love my rift, and tried the Contego for that reason. I wanted to like it, but for me it was just too big and for me I found the handle shape was unforgiving of multiple grip positions, but it really excelled with gloved used. Also since you mentioned the office, while in my office (your office environment and knife friendliness may vary widely) no one has said anything about my rift Rift, I guarantee people would take notice if I pulled out a Contego. I also think in it's native state it would tear up pockets, but the sharp G10 ridges are easily smoothed a bit with sandpaper so that's not a big issue.
I also have short fat fingers, and for me the arc on the thumb stud was a stretch, I never felt, with the natural grip location my hand went to, that I had good control of the thumb stud, it's the first knife I've had that I've noticed that on where I felt like the blade could get away from me so easily while opening.
It's hard to beat the 940 for a lot of blade in a thin/light pocket friendly package.