Well the Lumia's camera blows the 8X out of the water and with both of them having NO SD Card slot the Lumia 920 coming with twice the storage (32GB) is clearly superior. The Lumia also has a bigger battery and superior screen.
Really unless having the thinnest/lightest phone is your highest priority the Lumia is clearly superior - ESPECIALLY when you add in Nokia's exclusive apps which will not be available for other manufacturers' devices (Drive, Traffic, Music, City Lens, and their Camera Software will be souped up with tech they got from Scalado, among other things).
That is all something to consider because earlier today when I was going to a Cave tour and we lost absolutely all reception on AT&T Google Maps became 100% useless when it had to reroute, and Bing Maps would be no different. And since the cage is pretty much all low light for the most part, the Lumia's camera would have been superior to anything else on a smartphone. If I go back to Windows Phone, the 920 will be the only choice. And I'll ETF and switch carriers for it. It will be that good compared to what HTC and Samsung has coming out.