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Examples?

The one I have is crystal clear. It's my first glass type & all I can compare it to are the film ones I used in the past (on both OLED & LCD screens), which had slight orange peel effect in certain light but were still very clear.

The glass one I have now (Belkin TemperedCurve) however is impressive with how clear it is, either front on, or on an angle.
 
Film ones are definitely worse on OLED, making it look like a lower ppi LCD display. A decent quality tempered glass doesn’t seem to have any worse effect on an OLED or LCD.
 
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