Metal 2 won’t be faster than Metal 1 out of the box. Metal 2 introduces various new API’s and features that can accelerate certain tasks or even make them possible in the first place. If you don’t use them or have no usage for them, you’ll gain nothing from just Metal 2.
Also, be careful with that “10X the number of draw calls” statement from Apple. I haven’t seen the original talk so take it with a grain of salt, but I’m pretty sure that the “10X” is just a marketing value, which was achieved within a highly specialized environment that is probably very far from any “real world” application.