Here is a look at the differences. Both phones are at full brightness. The EVO (on the right) is much brighter. Also notice how dim the bottom function keys are vs the Evo.
Now look at the second set of pictures the EVO has 4 LEDs one for each of the lower function keys while the Thunderbolt employs only two, this is why you have some keys only half lit up on the Bolt.
I talked about this in ny first impressions post. The EVO has had server revisions since launch with either 2 or 3 different displays (manufactured by different companies). Hardware revision 003 was thought to be the best because it reproduced colors more naturally than the others. Mine was 003 with the Nova display while my fiancees was 002. Hers was a more vivid screen with a "cool" blueish hue. My EVO was not as bold and had a "warm" hue. My point is, the version the OP has is going to determine how it compares to the TBolt while my EVO would give a completely different comparison as would my fiancees. I find the TB produces a pinkish tint when viewing webpages and photos.