Definitely, Lenovo P70 is more powerful than ZTE s6. Also, it can be updated to Android 5.0 Lollipop or further versions.
Source: http/www.bhenet.com/2015/02/7-lenovo-smartphone-will-receive.html
i already checked benchmarks although im a pc freak and bought lenovo p70 yesterday worth every pence its just as powerful as xperia z2 in games (i tested same games on my cousin's xperia z2) but thanks for making sure its going to be upgraded to lollipop i was worried a bit