Level 82 Sorc, playing mostly solo (non HC), doing mostly T40+ Nightmare dungeons, just finished my first T50 solo which was stressful as hell since things just randomly one shot you off screen.
Finished 100% of everything in 2 zones and have nothing but a few quests in the other 3 (its a serious pain the a** figuring out what you are missing when there are no (!) indicators in any of the areas, and if you don't remember which of the random drop quests you've done you can spend time farming for something you've already obtained (or think that you just haven't had good luck with the quest drop). I don't even know if you get anything for 100%ing everything but its not worth the extra time tracking down the last few quests as opposed to just spamming nightmare dungeons to level glyphs.
Striderxdj#1264 if you are in Torment and want to group up