That's a superb introduction and lead-in wonglp!
I had my hands on the EM-1 and 12/40/2.8 for only a day, so pardon any lack of exploration of the customization. I did, however, customize my curve response at times and I believe can be a great plus for more technical photographers!
First impressions were that the grip worked very well. Even when I mounted the humongous 50/200 with an adapter, the camera didn't slip or anything during use.
Most other user interfaces should be familiar with Olympus m43 users, immediately striking a close resemblance to predecessors, with the exception of more customization controls.
Unfortunately, I did not have enough time to photograph the actual screen(s) functions and adjustments on the EM-1 due to lack of time.
Needless to say, since it's F1 week, I managed to take the EM-1, the latest Olympus Kit 12/40/2.8, a 40/150/4-5.6, 35/100/2.8 and the famed 50/200/2.8-3.5 ED SWD along for a day.
The Olympus EM-1 and the Singapore Grand Prix 2013
Diving straight into high-pressure situations with crazy stage lighting, the EM-1 performs at the F1 Village quite well under very fast changing stage lighting situations. It gets much more demanding on the AF system when it's super high contrast monotone lights plus lasers firing into the audience or at an angle with performers jumping around!
I used mostly 1 x medium AF area C-AF Tracking for these kind of performances, or say fast action shots.
F1 Village, EM-1 and VOX, Singapore's first ever pop-rock string quartet bridging contemporary and the classical.