Update your firmware. What I'm guessing is happening is that your Sharp Aquos is 720p resolution, and the PS3 may not be detecting 1080i resolution on the TV. If you don't have firmware 1.80+ installed, it'll output Blu-rays in 480p instead of 720p if your TV doesn't support 1080i, which means it won't look any better than a standard DVD.
If firmware still doesn't fix it, post back a reply with the exact model number of your TV and we can try and take another stab at this.
BTW, this doesn't belong in the Games section.
P.S. Best Buy guys have no idea what they're talking about. Never ever take their advice. If you paid more than $15 for your HDMI cable you were ripped off.
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