As I said I don't see any massive difference.
Yes IE isn't as crisp/sharp as FF, but the difference for me isn't a problem.
I use a large TFT and don't have the font size large, so for me it isn't an issue. However, there is a bigger issue, excuse the pun, IE8 doesn't display the full google page information that Firefox does, that really is noticeable when you compare them side by side.
Stranger still in Avant browser an IE clone, displays the layout in full.