I saw one yesterday of last years 13" and 15" compared. Now that the 13" is the same thickness as the 15" now, the image should be pretty accurate.
But I can't find the picture anywhere now that I actively want to take a look at it
Hmmm.. If it really is '2 ounces lighter and 0.04 inch thinner' then I suspect you are looking for a 'thinness photo'.. and I shan't think that there will be any visual difference accordingly, as that is < the 'thickness' OF a Photo.. BUT, it allows them to say 'IT IS THINNER' .. Yup.. Sure it is..