Even though I really wanted to purchase a Sigma DP2 Quattro, I decided to delay the purchase into the future, and went ahead and purchased a used Fuji X-E2 and XF 56mm F1.2 lens today instead.
My 5D Mark ii with F2.8 24-70mm lens is too heavy to carry around all the time. I wasn't particularly impressed with NEX-5, so I ended up taking photos with my iPhone when I am not doing a photo shoot.
I cannot really take photos that I like with my iPhone, so I've been looking for a smaller camera that I can carry around.
However, I really did not want to buy any more Bayer sensor camera for this, so my choice was either Sigma DP or Fuji X-series.