Actually, though VR is popular, I've stayed away from that--it was never a selling point for me. First, it tends to drain batteries more. Second, any lens I found difficult to hold steady, I used a tripod or monopod on. In fact, when your camera is on a tripod, it's important to turn VR off because your camera will go looking for shake and movement. Third, VR is only intended to deal with camera shake--not a long exposure (and the leaves moves slightly due to a breeze, or your subject doesn't stand still like a statue). I find that with Topaz AI, I can reduce noise from a really high ISO. And a high ISO means I don't need to worry that much about shutter speed (and thus camera vibration from a slow shutter speed). So for me, I've never deliberately looked for a lens that had VR. A few of mine do--but that's not why I bought them.
So that's a long-winded way of saying my 24-85 didn't have VR.
As for comparison with the 24-120, I have used that lens but not extensively. It was more of a case of "hey, want to try this out on your body and see how it works?" kind of deal with another shooter. I personally found the 24-85 to be a little sharper. But that's my bias. I find that zooms with a really wide focal length tend to be soft at both ends. As a general rule, primes are almost aways sharper (because they have less glass--fewer elements in the lens). And so what is GENERALLY true is that a zoom with fewer elements is going to be sharper than a zoom with more elements (because it has a longer focal length range). That's my bias on the issue. But I never sat down and compared the 24-120 and the 24-85 results on similar subjects to see which was sharper, had better tonality, focused quicker, etc.
I think the 24-120 is a great lens for people who want to put one lens on their camera and go hiking. Or walk around town. And don't want 2 bodies on them. Or to swap out lens. But most of my shooting with with a specific subject in mind. when I shoot portraits, I use my 85mm f1.8 prime. When I shoot family candids inside, I shoot with a 40mm f2 or something even wider. When I shoot Bald Eagles I bring 2 lens--a 600mm mounted on a tripod and a 70-300 on a second body around my neck.