Yup! Same here. I’ve had my watch for almost 3 months and just noticed today that I have a row of micro abrasions at the bottom and I’m really careful too! I used a microfiber cloth to clean it today for the first time and noticed it at the bottom. It was either from that or jacket use. That’s how careful I am with it and haven’t used it for exercising, etc., yet like what my SS 3 has gone through. It’s only in certain lighting but still disturbing. To put it in perspective, I also have the SS Series 3 for 2+ years and NO scratches on the display. I even cleaned it tonight with that same microfiber cloth! So probably from jacket or long sleeve shirt. Aside from the SS looking sharp, the durability is also another reason why I bought it after using Aluminum for Series 0 & 2. My series 2 had some light scratches, which was expected but also not that noticeable too and was so impressed with the Series 3, that without a question I went with Series 5 SS Black. I even sprung for the SS Black Hermès edition this time too. :/ I have done nothing different than I normally do. That Series 3 went through swimming in ocean, pool, hanging out at the beach, workouts, bike rides, light banging running into a wall, wearing a jacket (same jacket no less), etc. My series 5 has only been though a jacket and long-sweet shirts. :/ My SS did have micro abrasions on the SS which was to be expected but NOT on the display.
I have heard that the iPhone 11’s are also more susceptible to scratches than the X and XS but my 11 Pro doesn’t have a scratch on it at all after almost 4 months of use!! I almost didn’t believe that but now that it happened on my watch, I am wondering about that too. When I put the Series 3 next to the Series 5, I can see how the Series 3 may be more durable. There just seems something different in that that the Series 3 seems better quality. I’m not sure if it’s due to the allways on screen display and the coating or what but something does seem like the Series 5 is more susceptible.