I am using this phone from past 15 days and I havent found any lags in this phone, I will tell about my experience with Lenovo K6 Power 4 GB Ram ( Golden) .One of the great thing happend with me is I got this phone at ₹8, 999 same as Redmi 3s Prime, Actual cost is ₹10, 999, Flipkart was offering flat ₹1000 off on this device and was offering Extra 10% off by paying with SBI CARDS.
Sound quality is really good as it have Dual Speaker with Dolby Atmos, the sound is really good and loud and there are no lags while playing music.
Camera is also really good as it have 13 mp Rear and 8 mp front the camera is really good comparatively to Redmi 3s Prime.Lenovo has done great work on Camera.
Looking is really good.
Gaming performance of this phone was beyond my expectations it played heaviest games like GTA San Andreas, Asphalt 8, Unkilled without any lags, this phone get heated but not that much that you cant handle it.
Fingerprint Scanner is works well.
Battery works really well but charging takes lot of time as it doesnt support Fast Charging.
OVERALL EXPERIENCE WITH THIS PHONE IS REALLY GOOD AND I FOUND THIS PHONE WORTHY.
LENOVO K6 POWER IS BETTER COMPARATIVELY WITH REDMI 3S PRIME.