Not sure by what measure but -
https://twitter.com/Motorola/status/438396286833033216
https://twitter.com/Motorola/status/438396533453889536
More: http://www.androidcentral.com/moto-g-motorolas-most-successful-smartphone-ever
https://twitter.com/Motorola/status/438396286833033216
Q: Talk more about new motorola focussed on design, but also now on experiences and access? #MotoMWC
https://twitter.com/Motorola/status/438396533453889536
A: Mark Randall talking about importance of giving people access to smart phones. Moto G now Motorola's most successful launch. #MotoMWC
More: http://www.androidcentral.com/moto-g-motorolas-most-successful-smartphone-ever