I was facing the exact same decision last summer. For background, I'm also a Windows / Android guy. And a dedicated Lightroomer. On previous trips, I would just use my current work laptop, which for the past few years was a Lenovo. Wonderful (for work) machine, but the display just isn't up to snuff.
So I was on the hunt for a 13" display, 1920 resolution, USB 3, lightest package possible. The Sony Duo 11 had been favorably reviewed on this site, but that size display is just too small to be effective for LR.
Enter the Sony Duo 13. If you read the many reviews, watch YouTube videos, you'll see that people were amazed that Sony seemed to actually listen to nearly all the gripes about the Duo 11 and fixed them.
It's got Windows 8, and the screen is touch enabled. You can use it like a tablet, or slide it open and voila it is a laptop. It weighs 1.8 lbs and has the smallest power supply I have ever seen for a "notebook." The display is gorgeous and quite accurate, which is what I was looking for on the road. I bought the fastest processor and biggest SSD.
It also has a built in SD card reader, which was a bonus. Touch really brings Win8 to life. Plus there is a cool stylus to use on the screen. Battery life is about 8-9 hours.
I should also say I'm relatively prejudiced against Sony for computers, because I see them more as a camera/music/tv type company. I have previously owned two Sony laptops that were pretty marginal.
But this one is a great machine and at the moment I don't see how it can be bettered for a Windows based travel photography machine.
There is one ongoing issue which is discussed in the sony forums ad nauseum. Poor wifi. There's just some issue with the Broadcom wireless adapter. But you just buy a $10 usb wifi, which barely even protrudes. Solved. I don't generally need more than one USB port at a time anyway. Some people have sent theirs back, saying they can't live with a $1500+/- computer that has crappy wifi. Whatever.
I took the Duo 13 on a 3 week trip to Europe, and it was just great. Read up on it!