HTC One (M8) for Windows vs Nokia Lumia Icon vs Lumia 635: specs comparison

True, there aren't that many Windows Phone handsets right now to challenge the One (M8) for Windows, but if you're interested in this OS and are a US-based user, you should at least take a look at the Lumia Icon and the Lumia 635. The former is a high-end phone available through AT&T (keep in mind the the M8 for Windows will initially be a Verizon-exclusive), while the latter is a lower mid-range proposition that's available on both AT&T and T-Mobile. However, even though the Lumia 635 is in a very different category specs-wise, we think it does have a place in this comparison, since it can offer very similar functionality, along with a user experience that's not that bad at all.

How do these marvelous smartphones compare exactly? Maybe one has a faster processor, but the other compensates with a bigger battery? All the answers await in the following specs comparison!