Sabrina, If you're happy with down res, fine.
So you can't SHOW any loss of image quality in those two versions of the same image. I didn't think you could. And I'm reasonably sure that no one else can see any difference in image quality. That was my point from the start, and nothing you've said has shown it to be mistaken. And by the way, it isn't "down res."
Resolution of both images is exactly the same. It's only a reduction in the quality level at which the image is saved. And that reduction doesn't reduce image quality.
The DPR sample galleries always have full size, full res jpgs,
Yes, the dpr sample images that accompany camera reviews are always full
size/full
res jpegs. But they are certainly not saved at the maximum
quality level. A dpr sample image with the same dimensions as the OP's images in this thread has a file size of 7 or 8 MB, which means it was probably at about quality level 8 in Photoshop. So my point stands: When posting images in forums, you can get excellent image quality without saving at maximum quality levels and producing ridiculously huge file sizes.