I just wanted to note that a certain amount of jaggedness (or squaring off due to pixilation) can be seen in a multitude of objects when viewed closely in the game. This is with all graphics settings at their highest and edge smoothing maxed, and this has been the case for quite a while (since game release probably?). I think it's simply due to the level of detail supported by the game. The objects you took screen shots of don't look appreciably different in my game. The Windowbox of Superiority object is something of a special case because it is an object prone to fading (which means that depending upon your camera angle and distance to the object, some aspects of it will not be visible or will be partially visible). That means it can look like it has jagged parts sticking out if your camera is at a certain distance and turned at a certain angle. If you move around the object and change your distance, you will see those pieces of it come fully into view (and go fully out of view), so that you can see the entirety of the design. Why this particular object does this and other similar objects don't, is another question...
As for the post regarding the Juice Barrel Plants object from Cats & Dogs, I am not seeing any pixels out of place in my game. I didn't really see anything wrong in the picture you posted either, but that could be because it wasn't showing a close enough zoom. If possible, it would be helpful if you could take a closer shot that shows the specific pixel(s) (go into live mode and use TAB to get into the free camera).
