Lol, also in a more direct answer to your question;

**Any reason doing 1024x1024 vs 2048 x 2048? or is it sometimes the source is not of high quality to warrant 2048x2048?
**If you can originally produce a larger texture (2048) that would always be better. If you don't need something that large, it can always be resized down before use.

A couple of reasons for larger dimension textures;

1 - Even though you can scale an image to repeat more times across a meshes surface, you can usually only do this so much before the pattern of the texture shows itself off to the viewers eye, and looks unrealistic. With a larger sized image, you don't need to have it repeat as much, and the quality, realism is easier to pull of..

2 - If the image texture is on an object that is close to the 3D camera, then you have to start worrying about the image texture appearing pixelated. I run into this all the time when using an image texture on the ground, if the camera is not very high up, the image texture nearest the camera can start to look "blocky". This also becomes even more apparent if/when you render out larger, so you can print it out on your home printer, or also professionally printed.

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