I was surprised how good my X5 was in a deep snow. Last winter I tried to get to our summer house. There was fresh snow, depth varying from ankle high to knee high and X5 pushed through without too much struggle. Although there was a patch of snow up to X5 headlights which finally stopped me. I was able to reverse out of it and managed to kick snow around to get it a bit lower. More speed and over we went. Overall I was very impressed as was a Cherokee owner sitting next to me!
Few years ago I owned a ZJ Grand Cherokee which was much worse in snow, although it had much worse tires as an excuse. I can confirm that good tires make a big difference in winter driving.