Hands up if you’ve heard of the ASUS Zenfone 2, a strong candidate for smartphone of the year if value for money is of utmost importance? Yes, well, it’s about to face some serious challenge from a most likely source in the Far East. Meet the Lenovo A7000, a low-cost challenger in the mold of the Zenfone sequel, with its large HD display and rather beefy specifications, which includes LTE and a rear-mounted speaker that makes use of Dolby Atmos audio settings. The latter is a world first, according to Lenovo. Not that those settings make much of a difference …