I am going to vote yes, but I'm not an expert - I want to see what others say :) I think I may have this one actually!!!

To me, it doesn't look like a chimera. It looks more like a white blossom with a blue edge, like Optimara Maine II or something like it.

Cork,

Check the Optimara site and see if you can match it with their pictures.

Linda

Since I see a blue blossom and a half colored white blossom - I would say - this plant is sporting - and it is sporting towards chimera. But this instability can be an issue - because you can get the suckers - they will start as chimeras - and then deteriorate to blues.
Fun to observe though.
Irina

To me, it looks like Maine II. Chico is another one that has a similar bloom, but much different leaves. Go on the Optimara site and look for Bi-colored blooms. I agree the sporting tendencies are fun to watch..