It's an interesting one this. I tend to agree with you. Hazard looks much more polished a player. Sterling can be infuriating at times. However, he is 4 years younger and that has to be taken into account. Also Sterling delivers in numbers at least
Sterling 2015 11 goals, 10 assists in a season where he got pelleters at times. Was decent for me up until New Year.
Hazard 2015. 6 goals 8 assists. Granted there were challenges at Chelsea
Sterling 2016. 6 goals 11 assists. Missed too many chances granted
Hazard 2016. 9 goals 4 assists. Played upfront a few times
Of course Sterling needs to improve but compared to players at a similar age, his numbers are up there.