Professional videographer here. I hadn't previously heard the consternation about the lens flare issue; I've owned my iPhone 11 Pro for a few days. I noticed while shooting this room that a peculiar flare was appearing; a mirrored ghost of this bright, ornate light fixture. I went to our IT department, and we tested every iPhone since the 6s, as well as a few different Android phones.
Here's the verdict: all phones produced this flare, but none as strongly as the 11 or 11 Pro, which performed identically with the standard wide lens. I have my theories about the cause of this, but it's clearly the hardware. It affects both the wide and tele, but not the ultra wide or selfie cam.
Removing these flares isn't a huge deal in photos, but is essentially impossible for video. It's hard to understand why no professional reviewer mentioned this issue, particularly given the emphasis on this iPhone as a video production tool. I haven't decided if I will keep the phone or not, but I don't see how this could be mitigated without a hardware revision. It could be as simple as a change in the coating, but I think it's likely to be a bigger issue.
Unless Apple has secretly changed the hardware, I'm very skeptical of claims that a replacement has fixed the issue. To those who say the issue doesn't exist, it does to some extent on every phone I've tested, so that's clearly wrong.
If you point this wide or tele at a bright light source, it's going to flare, and it's unavoidable. As you can see with this shot, it doesn't even require much contrast--the room is relatively well-lit. My recommendation would be to either learn to live with the issue, or pass on this model.
