a slim browser, 333px wide:
the sizes attribute is set correctly:
the image is loaded correctly:
but yes it looks blurry!
look at the image, i think the image itself is blurry:
https://juengerkuehn.com/wp-content/uploads/JUENGERKUEHN/WEBSITE/sizes-4096x1651.png
any chance you might be able to transform this image into an svg, i think illustrator or some other program had this feature where u can let it create an svg out of a normal image automatically
for images like this that are mostly just black and white shapes, an svg will always produce the sharpest result with the least amount of data size