Compare Canon 60d with 17-55 2.8 IS vs. Canon 6d with 24-105 4.0L IS

Just got my 6D with 24-105 f/4L, replacing my 7D with 27-55 f/2.8.

The 6D is slightly lighter and feels good.  Only played a bit so far, but the low noise at much higher ISO speeds will more than compensate for the loss of 1-stop in-camera (albeit better DOF control with 2.8, of course).

For family shots, you're going to love the WiFi.  Just a couple of button pushes and I can connect my iPhone and view all pictures on the camera memory card.  You can rate the images or delete bummers MUCH easier on the iPhone than in-camera.  Also, you can pick an image and instantly email it, your quality of photo sharing is really going to jump.

I myself do a lot of astrophotography.  The liveview on the iPhone will WAY MORE than compensate for a pivoting screen of a 60D when it comes to fine focusing.  Focus is a pain in astrophotography.

Jim