Sorry for taking so long, been really busy with Christmas and work.
Here are the pictures I mentioned I'd take, uploaded them to imgur since I belive most people know it and trust the url.
EDIT: it won't let me post a link to the album, so if someone with more than 10 posts could PM me, I'll send the link so you can post it for me, please?
*All pictures were taken at high brightness on both devices, except when stated otherwise.
As you can see in this comparison, the L925 display is clearly outclassing the L930 display, despite the much higher resolution.
Also, it's not a rendering problem since the screenshots taken within Windows Phone are perfect matches (as far as their resolutions go).
Something that couldn't be noticed from the digi cams was the sharper Angry Birds Epic on the L925, but since it wasn't easy to notice the "blurry" image on the L930, I left the pictures off the album.
The Mahjong screenshots might be because the L930 uses a different aspect ratio (16:9) than the "older" phones like the L925 (15:9) and it makes sense to adapt most things to the 15:9 aspect ratio, sinced all Lumias x20 and x25 use this. And I belive they're much more spread than the newer models with 16:9.