Does matte or glossy affect the sharpness of text?

I know there's tons of matte vs glossy threads, but I've never seen one discuss how matte or glossy screens might affect the sharpness of text.

I was at an Apple store today, comparing matte and glossy screens on the MBPs. I started looking closely at the text in Safari, and it looked like the text on the matte 1680x1050 screen was a bit sharper than the text on the glossy 1440x900 screen. Of course, the text on the glossy 1440x900 screen was a bit larger than on the matte 1680x1050 screen, so I adjusted for that by hitting Command + on the 1680x1050 MBP to enlarge the text. With the text both at the same size, the matte 1680x1050 MBP still looked a bit sharper than the glossy 1440x900. Has anyone else noticed matte screens having sharper text than glossy screens?