Did you read the link that I provided?
Most of what you read about something sounding one way or another in regards to CD players, DACs, receivers, amplifiers, preamplifiers is heresay from folks that either get paid to say they sound "special", think that higher cost attributes to better sound, or they read somewhere that something sounded a particular way and when they listened to it their mind fabricated a sound that wasn't there.
I can tell you that I have owned many CD players of many ages, many receivers of many ages, many amplifiers of many ages, many preamplifiers of many ages. These range from low end basic things to some pretty high end or highly regarded stuff. DACs have been linear beyond human hearing ability for a long time. Some boutique brands sometimes intentionally design their products to have a certain sonic signature, however most don't. Virtually every mass produced brand of audio components produce linear undistorted sound that doesn't have an impact on the sound in your sound system unless it is faulty or being pushed beyond it's limits (eg: amplifier driven to clipping).
If your sound system sounds bright while listening to CDs it's more than likely attributed to speakers and/or room acoustics and layout. It's highly propable that the perceived difference between the Sony CD player and the PS3 is caused by a bias. I've experienced differences before as well, but after doing some double blind tests I've come to the conclusion that most differences I had perceived where caused by personal bias and those differences where null after the DBT.
It's also feasible the PS3 happens to have a poor analog audio output for whatever reason. I do think it's unlikely, I haven't noticed a difference myself but I don't use the PS3 that often to play CDs when I have a multi-disc changer.
