Im not buying it for ppi I’m buying it because the CX48 is a bit too big for me and the 42” would be a lot more comfortable.I don't think it's worth the upgrade for just an increase in PPI but that's just my own opinion. Personally I'm going to upgrade only when the "OLED EVO" technology gets added to the 42" panel, I'm willing to buy a G series OLED if I must.