1.the scale of the scene is like 286m a side for the square floor..
2.one of the glasses has subsurf 1 and the others 2
3.the geometry at top of the glass is perhaps a bit sharp
4.some of your settings are off particularly MNCR and LM prob
5.I am not sure why you have lamps in there but...
I have a render going atm to see how it turns out but not doing anything about no.3
ok well I have slightly different materials and both panels lit but I dont see the issue here
btw I couldnt see the water mesh anywhere was there a problem with that perhaps?
