Replacement in-store successful today. I was surprised. They had only 1 replacement "white box" left.
The blemish is barely noticeable - A LOT better than my original phone. I think it's the same condition as 6thDAYS's 4th replacement. Literally, I put the brightness at 15-20% and there's hardly any blemish to see. It's well hidden. Played around with all other brightness settings - full brightness is obviously beautiful as you can imagine. The holy grail as well, perhaps? My serial number still shows C39, so week 39 in production? If that's wrong, feel free to correct me and I'll post back with my manufacture date.
Also had the time to look at 10-12 display models. All had blemishes, but just like my replacement - super super super faint. None stood out like my original phone. You REALLY need to be OCD to see it, and that's if you mind doesn't play the stupid illusion on a fully white background.
The genius, on the other hand, wasn't too nice to me.
He couldn't see my blemish. I brought over the manager and she saw it in a heartbeat. I asked the guy if he had the 6s Plus, which he did. I noticed his had the blemish too. He denied it. Also, he claimed I was limited to 1 replacement and that's it (which I say is bull, I can always go back and see another genius the next day). Also, what really set me off the most was when I introduced him this 27-page thread on the blemish. He said that it's a small sample size of 100 out of 13 mil (ok, he's right about sample size, but that still doesn't prove that non-tech savvy people and non-forums users still have the blemish, too). And worst of all, he claims us forum users "pull stuff out of our ass". That was pretty rude from an employee-customer situation. I shot his comment down so fast I got some heads turned to see what was going on. Nonetheless, I kept my cool and got the replacement and gave him a smile & handshake on the way out.
Now, to get the replacement glass screen protector. It's on the way via free lifetime warranty, just gotta wait a few days!
Can't post a pic of the new phone now since I don't have a 2nd camera, but if you guys want me to put one up, do let me know and I can provide.
Hope this helps anyone out there anticipating replacements at the genius bar!