I have found that the canvas "fades" with use. Actually, I think the canvas accumulates more of a "sheen" with use. This had happened with my monogram pieces. My oldest piece is less "vibrant" than my newer pieces. If I compare my two wallets, they look much like your bag vs. your friends bag. I also read on the forum that the color of the canvases can vary slightly. I have noticed this with ALL of my monogram pieces. None of them are exactly identical in color. This is completely normal, and your DE piece looks just like the pieces I have seen in the LV store. The colors just appear less vibrant with use due to the fact that the material becomes more shiny, subduing the actual colors of the canvas. It's hard to explain. You have nothing to worry about IMO!