25 years of shoting with nikon ended for me..

Congrats on your purchase! In my case after buying the XE1, the d600 doesn´t get used that much. I think mirrorless cameras are set to replace most dslrs, even full frame ones. Phase detection is already in place, so focus speed and tracking could pretty much equal dslrs. Improving the evf/lcd refresh rate to 120fps to reduce lag would be the killing blow. The XE1 resolution as of now is already good enough for me. Enjoy your new camera!