Well I'm a noob, so maybe my experience isn't the what you are looking for.
I have a silver Lexus. It's a 2001 I picked up used. The previous owners didn't take care of the finish to Autopian standards. I just started to get into detailing, so I've washed it in the past with the sponge and 1 bucket method. I mention this just so you know that I do not have a perfect finish.
I was able to wash it (2 bucket) with Megs Deep Crystal, dry it, clay it, and then added 1 coat of Megs NXT paste wax. I could not beleive how shiny the car was the next day.
I drive East on my way to work and it's a good thing I wear sunglasses. I had a perfect image of the sun reflecting off my hood near the windshield. It was almost like looking at the sun off a mirror. In the parking lot, the car just reflected light and if you had the right angle it would almost blind you.
I can't get the same deepness and image reflection that a dark vehicle can because the finish reflects too much light. Only in low light situations can I see a good reflection.
I would think that it's the overall reflective power and flake pop that would separate a detailed silver car from a non detailed silver car. I'm pretty sure that people can tell.
I can't wait to see what happens after I take the PC to it and top it with some VM and Natty's paste wax.