Huh, interesting. I just checked on my phone. I have a recently-updated Lumia 520, but one bought from a telco instead of directly from Nokia.

My useragent starts the same as the one in the screenshot, but in the end, it has "like Gecko" instead of "like iPhone OS 7_0_3 ...", and, as if it was important, I have my telco name in the useragent (!) - the result is, gmail renders for me like in the latter screenshot.

Seems it's the last time I bought a phone from a telco company.