There was a good review of the 43" Phillips but I don't remember what they said about input lag. I will say however that there have been a number of people who have experienced rather nasty image 'burn-in' on the Phillips to the point that it scared me away from buying it. (I got the Wasabi Mango UHD430)
My Wasabi Mango UHD430 doesn't have the burn-in problem, nor is there any really noticeable input lag. Keep in mind though that while I don't notice input lag, your mileage may vary.
I dont play 'twitch reaction' based games - I am more after the screen realestate, but still be able to play games like WoWS, Witcher 3, Mass effect, Deus Ex etc.