I have been on 4 Il-86's, all with Aeroflot between London LHR
I found them all to be comfortable and smooth. They felt 'heavy' handling, smooth in the cruise.
The seats were slightly better than the standard Aeroflot seats (I have found that aircraft made after about 1985 had a different type of seat which is much better).
As for the cabin, it's absolutely cavernous. No central overhead storage makes it look huge, as others have said. I never got the chance to fly on an L-1011 so I can't compare it.
The seats have an oxygen mask and fan (with own motor) in the back where you might find a PTV on other aircraft.
The landings were all 'Boeing style', firm, flown into the runway...
Overall, it's a good, comfortable and safe airliner. I have no complaints.
Horus, the Il-96 and Il-86 are completely different aircraft, they just look similar externally.