Very few match on all aspects. I'd tried a few and always had one terrible issue. Terrible battery life, lousy screen, and/or terrible touchpad. Apple does seem willing to make improvements without as much worry about backward compatibility. There are a few that match on everything I care about, but often cost more than the Apple.
People like to complain and mention byzantine purchase methods. Wait for a lenovo sale, buy the bare bones model, apply the discount code, then buy dimms and SSDs from random bargain basement sellers. Oh and buy the linux compatible wifi card and do surgery on your laptop to get wifi working after suspend.
MBA is pretty compelling mix of performance, size, cost, and battery life. Unlike any x86-64 laptop, you can pay $500 more or so and get double the memory bandwidth. Or another $500+ and double it again. Definitely makes the macs better any PC at some workloads. Sure some x86-64 with a nice discrete GPU is way faster ... when plugged in to wall power.