You can watch and perhaps come to your own conclusion.
I have the 2014 m135i pre-LCI and with 6-cyl., 3ltr ready to go anytime and RWD, I'm blessed to be owning this car. Start the engine and I'm all smiles. It's significantly more reliable than my BMW MINI, but that's just my comment from my own experience. Only downside, is the higher tax and insurance premiums, probably due to my age.
The new m135i supposedly has better build quality and definitely comes with new tech. in it. These are something I can live without. I cannot live with the ugly fronts, no matter how I try to make it work, and this is subjective.
It is ultimately your choice but hopefully you can make a more informed decision with this. Go for a test drive!