I would rather have 25% less battery for 200% better resolution. Apple's done nothing but incremental or nice-but-not-necessary improvements for years now.
Being able to do a full day of meetings, using the laptop all day (12+ hours of real use), and finish they day out at my hotel with 15%+ left is something I am not about to mess with.
To me the only real deficiencies are the dual core cpu and the increasingly dated resolution.
Then consider that half the time I'm mobile, I'm doing something else too, so I just shut the lid and let it sleep...
The ease of only having to leave my hotel room for a 4 item checklist (wallet, keys, phone, laptop) is great. I used to carry a huge Lenovo bag with everything I might need, replacement batteries, powertree to share power in case there were not enough, charger... nothing like making that slim and sexy X1 require 10 additional pounds of gear.
Additionally, and worth mentioning, I don't use laptops as desktop replacements (anymore)... they are just a portable computer until I can get back to my "real" computer. I would be a very unhappy guy if I had to work for a month nonstop on any laptop these days.