WOW, a lot of people are ignorant around here. How about using it first then opening up your trap?
I've been running it for several months and it kicks Iphones ass all day. It has the best phone browser on the planet. Multitasking like nothing else in the market....but yet, you think your opinion is worth something.
The Z10 got a 1700+ sunspider score. The iPhone 5 gets sub 900ms.
The Z10 browser is a complete dog compared to mobile safari. You are either a troll or ignorant.