I've never held or used a Q5 as I am in the states but I will say this--The Q10 is the single finest smartphone I've ever used--period! The typing experience is second to none-keyboard or virtual--and the OS is awesome, especially with the latest update and the leaks that are on the way. I live in So CA (USA) and it's sunny most of the time outside, and I have yet to have a problem seeing or reading the screen, even with sunglasses on--and that is the absolute truth. The battery life is amazing and the apps and browser respond so quickly that it's faster than my wife's iPhone 4S and faster than my Kindle Fire HD, or my friends Samsung GS3. I gave up a little real estate for the keyboard but have never missed it as I absolutely can not type on a virtual keyboard, even the Z10's which is light years ahead of the iPhones and Android keyboards, but still, my typing on a virtual keyboard sucks, so the Q10 was the answer. So far zero problems or issues with it and for the money, ($99 USD after trade in and upgrade contract with AT&T) was a great price. I believe the Q5 is going to go for about the same price with a contract over here once it's released. I'd say that anyone considering purchasing a Q5 vs a Q10, play around with them both in a normal routine and choose for yourself afterwards. Both are awesome devices! Good Luck with your choice.