2GB RAM, 2560 x 1600 pixels, 10.1 inches (~299 ppi pixel density), Corning Gorilla Glass 2, 1.9 MP Front Cam, Dual-core 1.7 GHz Cortex-A15 (this beats many quad core Android processors even)
VS
1GB RAM, 1536 x 2048 pixels, 9.7 inches (~264 ppi pixel density), No Gorilla Glass, 1.2MP front cam, Dual-core 1.3 GHz Cyclone Processor
I do concede that the Nexus 10 is heavier and thicker than iPad Air and battery life is 1hr less but that's because it's pushing more pixels and it's more powerful. Keep in mind the Nexus 10 is ONE YEAR older which is like a light year for tech. The new Nexus 10 that will be released in the next few days will blow iPad Air out of the water on pure specs no question. I'm not saying the experience will be as pleasant though. We'll have to see.