[stoppingdown]

No idea why an E-M1 would cause any headaches,

 

Well, perhaps I've got a twisted mind, but the E-M1 is the camera that triggered my intention to move to mirrorless. In fact I had been lazily following the MFT segment until a few months ago. When the E-M1 came out and I saw the first reviews, I reckoned that we was at a turning point and I could move from the D5100 to a mirrorless camera without losing quality. Then I started a deeper analysis and got to Sony and Fuji as the two "finalists", in the end picking Sony because Fuji doesn't offer my favourite focal range in a single lens (16-70mm) - it's a pity, because I like Fuji cameras a lot more than Sony....

 

Curiously, the E-M1 is indeed still behind the D5100/D7000 for a relevant point, that is high ISO (see DxOMark), but the whole point is still valid. In the end, the E-M1 made me spend the whole photo budget for 2013 to Sony instead of Nikon, after 15 years of absolute loyalty to Nikon.