You already listed the GFX so I won't bother.
Apple Macbook Air - Top Base Model - 4GB mem, dual core i5, 256 GB SSD, wireless 802.11ac, OS OSx Mavericks, weight 2.95 lbs, price $1,299.00.
Lenovo Yoga 2 Pro - Top Base Model - 8 GB mem, Core i7-4500U, 256 GB SSD, wireless 802.11n, OS Win8.1...