Technical write-up on a preproduction FS7: http://www.dvinfo.net/article/acquisition/sonyxdcam/first-look-sony-pxw-fs7-l-s-s-shoulder-mount-camcorder-part-1.html
Canon only has the C500, at more than twice the price and far worse ergonomics, to compete with the FS7 right now. Sony is running away with the market.
The EVF and OLED on the C100mk2 are nice, but they're still in the wrong places. The necessity for external recorders to get high bitrates is also obsolete (it's excusable for RAW but that's it at this point). Canon's product cycles tend to be long and that's why this is a concerning development; they absolutely need an FS7 competitor delivered by NAB or they are going to be left in the dust.
The one really nice thing the Canons have going for them are the included ND and IR filters, partly enabled by their long flange distance. But the flexibility of the mirrorless mount on the FS7 can't be denied, and Canon's EOS-M mount was a spectacular failure and can't support full frame 135 sensors anyway. Sony has been calling all the right shots and finally with the FS7 pulled together a product with all the checkmarks. Three years ago, the C300/C100 were great options, and they still have a few advantages left over the Sonys, but absolutely not enough to sway purchase decisions at this point. The fact Canon have yet to respond to the Nikon D800 even is suggestive of serious difficulties in their pipeline. That said, they retain market leadership largely due to their absolute successes in 2012 and earlier and the inertia of people's lens collections.