Favorite lens is the 11-22mm
Between this and the 22mm pancake, I don't need or want anything else for the M mount
my wife loves the 22mm pancake which she uses when I use my a7 and 35mm 1.2.
I love the 11-22 for outdoor shots of cityscapes or nature shots. the wide angle is awesome, and I enjoy having it in such a small package. It's especially sweet that the EOS-M, 11-22 and 22mm all came in at under $700!
we pretty much one for day, and the other for night. it's a fantastic little bit of kit when you don't need awesome AF. Unless they make an equally small 2.8 wide angle(seems impossible) I probably won't consider any other lenses for the EOS-M.
In fact, although I love the kit, I am tempted to sell the whole thing here in China and swap it for a Sony Nex-6 and the 10-18mm(that actually works pretty well on the a7.) The lack of new cameras, lenses and info in the US is making me think Canon has created a dead end system, and I'm a little anxious about it.