The whole A$AP Mob puts out some of the sickest shit. The Lord$ Never Worry mixtape is pretty good stuff real ignorant haha.
Chance The Rapper is one of my favorites cause his word choice and rhyme scheme is unlike anything that is out today. His rap has almost soul to it that adds to how enjoyable it is to listen to.
Also, his homie Vic Mensa is really sick and has almost the same type of flow. Mac Miller is still SO good imo. He has always grown and gone through different styles of rapping and has a lot under his belt especially being an independant artist.
Joey Bada$$ and the whole Pro Era crew make some different 90s sounding rap that I can definately bump to.
G-Eazy I like but he is just another rapping white guy haha imo he isn't really doing anything spectacular to the rap game.
Big Sean also has been making moves and his flow in "Control" and the "10 2 10" remix is what makes his stuff he puts out that makes me appreciate his music.
Drake's best year so far has got to be 2013 NWTS is crazy in how much work he put into making it and became a classic instantly for me.
But Kendrick...is king IMO he is the best as far as talent goes. Almost all his rhymes have a much more deeper meaning and he ATTACKS everything he's put on yet still releases songs I can hang out and listen to. His "Look Out For Detox" is something to take not on. I'll post links later.