I'm proficient in DKC2, but I never really got into this one, I don't even think I've beaten this one 102% yet, it's my least favorite DKC game.
Holy shit I thought I was alone on this. So many people list it as their favorite DKC game, but along with DKCR it is the only one I have never done a completionist run on. It's a good game, but I have just never enjoyed it as much as the other games in the series.
For me Super Mario World would be the game I know the best. I can do a 96 exit run no problem without checking any guides. Same goes for Donkey Kong Country 3. Ocarina of Time would be close, but I can never remember all of the gold skulltula locations. The original Wizardry would be close too. I know the game very well, but not every single square of the dungeon or every possible item one could get in a random chest.