Tech: yes, and some people blindly defend things because they have a romanticized view of it, others will stick to their belief regardless of proof to the contrary. Some people like beef jerky. Some people don't.
All interesting observations with no real application here.
Nano: it beats the iphone5 in lowlight, according to other sources. Its just too early to say, really.
I read GSMarenas review, and its mainly just praises. Like all the other tests.
Lumia 920 might have an edge videowise due to ois, and most likely in low light shots. However, video might have drawbacks that would overall mark it lower even with ois.
Not sure. As said i can easily do comparisons when i get my copy of the s4, it will be easy to see then.