No high resolution graphics on the desktop?

High resolution graphics don’t seem to be loading on the desktop when the scale is above 100%. PC top, iPad bottom:

• Example 1
• Example 2

Perhaps SVG would work better for these sort of graphics?

Well, the image they're using for the logo (for example) is the size at which it's displayed at 100% (110px x 75px). I don't know how or if separate images are being loaded for the iPad (they use the same image for all screen widths, as far as I can tell), but fixing it for the desktop would be as simple as switching out the low res one for a high res one and scaling the background down to the size of the div. I think IE still has problems with scaled .pngs and aliasing, though.