Product images are blurry on the website

Hi,
I noticed some other people also have this problem, the products’ images are blurry… I have tried every possible way to fix them but without success!
In WooCommerce Settings -> Product Display I have already adjusted the images to be at 800×800 (no hard crop) on product’s page, regenerated thumbnails but hasn’t changed anything… If you see the product’s page and then zoom on the image, you will notice it is more sharp and good looking than the original image.
I also deactivated all plugins but without success…