My day to day knee ability is better than it EVER was and I'd rate it at a 100% full recovery.
If I do something VERY strenuous - i.e. hike more than 10 miles, ski every day for 7+ days straight, etc. I will brace it. I have noticed some slight swelling and discomfort if I push it TOO far so I make an effort to brace it before it gets to that point and I don't have any issues.
I'm a sports photographer and can easily run NFL sidelines constantly squatting and standing for the perfect shot without an issue - that's something I couldn't even imagine at the time of this surgery. I'm comfortable skiing, hiking, swimming, even being cramped up in a kayak for a few hours I have no discomfort when I get out. I hate running but that has nothing to do with my knee!
Important to note: while I ended physical therapy after what was recommended post surgery, I do remain very active and in shape and I believe that has an effect on the positive results I've seen. I'm not some extreme athlete or anything, but I now live in Utah where I practice yoga multiple times per week, hike with my dogs regularly, ski all winter, snow shoe, etc. The yoga especially has improved my mobility, and all of these activities have allowed me to keep leg strength that I believe makes a difference to how well my joints function.'
Ps, yes I know my dog is awesome. He has his own instagram @GreatDaneGatsby if you want more ...