Well first thing would be this is not the fastest SD 800, Note 3 is the best so far.
Then I would wonder just how optimised the 1520 is, I mean its Nokia's 1st full spec phone, and just how well does the software run with the test programs with a windows phone.
Even after all that the IP5 is a high end sheep...sorry phone....and be glad that Nokia finally dragged themselves up to other makers levels of tech.
TBH I dont see them pushing the power side too much, that will always be Sammy/IP/HTC/Sony, there is not enough games to push the phone yet, maybe in the future if more people go over to windows then there will be a need for more of their phones to rock the best cpu/gpu.