I’m sort of a “I have to carry it all” guy ;-)
When we went to New Zealand, I took the D600, 70-300 f/4-5.6, 24-70 f/2.8 and 16-35 f/4. It weighed aboub 12 pounds, with chargers, batteries, etc.
The 16mpixel sensor in the OM-D EM-1 is actually better in terms of noise than the 16mpixel D7000 I used to shoot. And given that the largest print size I use is 13 x 19 (I’ve got a Canon Pro 100), 16mpixel is definitely enough. I just have to decide if the lenses are good enough.
I’d actually replace the Nikon gear, if I stick with the OM-D. One of the neat thing about u4/3rds are the other bodies. I could also pick up at a later date a Pansonic Lumix DMC-GM1, and use the same set of lenses on it. That’s roughly the same size as the Sony RX-100, though lenses would add some bulk.
Ditching the Nikon gear is not an easy choice, so I haven’t decided which to keep yet. But I’m certainly impressed with the EM-1.