I own both keyboards and comparing the piano on G70 with the piano on Tyros2 is not fair. Is like comparing a Ferrari with a Hyundai.

Whenever I need to use a piano sound when playing, I always choose the G70, because the sound is better. I can compare both keyboards side by side, not through low resolution videos and questionable sound recording.

However, if you only have a Tyros 2, you will not be embarassed by its piano sound: its just not so good as the G70 Grand X.