As I wrote a few posts ago, the EM1II with 12 f1.4 has become my go to set up for my morning bike rides. It does, however, have some not so awesome lensflare and a beautiful starburst if you can control it. Here are a few shots to give you an idea of what I am talking about.
While I absolutely love this lens I am disappointed that for the price of this lens and the PanaLeica badging that the unwanted glare isn't better controlled. It won't stop me from loving and shooting this lens. But it will stop me in certain situations.
Sometimes I am able to use it effectively or for a specific effect but sometimes it's un usable. But in the end what is acceptable to you is up to you.