What are the differences in the panels of the HP Z24i, E241i, Z22i, and E221i (besides size, resolution)? Different anti-glare coatings? Also, PWM differences? The coating on the Z24i looks great at http://www.overclockers.ru/images/lab/2013/11/25/2/92_kristaleffect_big.jpg (second row, third from left), and I wonder how the others compare. Thanks!