HTC has shown its hand for 2015, it's high end race horse for this year, and the last smartphone to be launched under now ex-CEO Peter Chou. It is clear from a glance, and from a bit of reading of HTC's PR materials, that the One M9 is its most refined, most luxurious looking, and most advanced smartphone to date. But is it it's best? And more importantly, can it boast of being the best when put alongside other 2015 smartphones? SlashGear's Chris Davies takes the smartphone for a spin to find out the answers for himself.