Are K frames easily carried? I figured they would be too big to easily conceal.
Personally, I find 4" K Frames extremely easy to conceal and comfortable to carry. I love them too, which also has something to do with it ... since you aren't "feeling" the Glock, you probably won't enjoy carrying it and it will quickly become a pain, literally.
A K frame or 19111 is possible
IF you invest in a good quality gun belt and holster and are will to dress around the gun a bit (more or less depending on the stocks on the gun and butt configuration - square or round). Also, you have to be motivated to carry it. A motivated gun nut will find it easy to carry Dirty Harry's S&W Model 29, while a non gun person who's just interested in protection will find a Ruger LCP uncomfortable.
For a gun belt, something like a 1.5" bullhide belt from thebeltman.net works wonders. Excellent, long lasting gun belts.
For the holster, I like the FIST #20 leather IWB, with optional sweat shield that keeps the hammer from digging into my side when I'm seated. I'm about to try a Milt Sparks Versa Max II for a 4" S&W N Frame, when it arrives in the mail in December. Yes, I find even a massive war hammer like my 4" S&W Model 28 doable, though I don't carry it every day. The VM II has an excellent reputation, and the price and wait time reflect that. I think its about a 10 week wait, and the cost is around $125.
I find 4" revolvers more comfortable to carry than sub 3" versions. More gun to spread and balance the weight and pressure over a larger area. Push your fist against your side, then with the same force do it with your palm and fingers spread out. Feels more secure against my side than a 2" snub. Granted, I am 6'7". If you are 5', a 4" barrel may prove a little long when seated.
A round butt with the S&W factory service stocks (and if you need it, a Tyler T-grip adapter) is very concealable. I have a 3" Model 13 and a 2.5" Model 66 that I can conceal with nothing more than a white T-shirt.
Square butts require a bit bigger and baggier shirt, but I do shoot them better. So it is a tradeoff.
As for 1911s, I frequently carry a steel 5" Springfield Milspec. Again, with quality gear (a Gary Brommeland Max Con V leather IWB holster in this case), I find it the most comfortable gun I own to carry other than my flyweight S&W 642 in a pocket holster.
Carrying a big heavy gun takes a good week or so to get used to. Eventually I got to the point where I rarely notice it. Still, having a little pocket blaster like a S&W J Frame or Ruger LCP can be really convenient at times, such as when doing yard work.
I will say that if you have back, knee or hip pain, carrying a heavy gun like a steel K frame or 1911 may be a challenge even with high end carry equipment.