I have higher resolution user picture than Ray but my icon is totally blurred and Rays is sharp.
https://odoocdn.com/web/image/res.users/1028106/avatar_1024?unique=f9b4286
https://odoocdn.com/web/image/res.users/1272888/avatar_1024?unique=18256c7
https://odoocdn.com/web/image/res.users/1028106/image_128/40x40?unique=f9b4286
https://odoocdn.com/web/image/res.users/1272888/image_128/40x40?unique=18256c7
Seems as either lack of documentation as picture size is not given or fault of the scaler.\
