I've moved from an iPhone 7 to the 12 Pro so noticing a big difference.
I was worried it would feel to big and heavy in the hand but actually it feels comfortable and solid. Not too big for my pockets either. The edges do feel quite sharp but of course it has a protective case on already. I went for the Torras Diamonds case which still shows off the back colour nicely. The lips are slightly raised, which should protect the glass better, but not so intrusive as to make 'swipe up' unlock awkward. It feels comfortable to use, but is obviously a bit plasticky. Might look at the Apple leather cases when they come out - they do have a lovely hand feel.
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The screen was yellow initially, when transferring data, but I switched off True Tone after set up and it now looks fine. Coming from the IP7 it looks huge but also incredibly sharp - the detail in previously stored photos, taken on my DSLR, really pops out. Transferring data from the old phone was a doddle and only took half an hour.
Speed is hard to quantify but everything on the phone just feels quicker and smoother, whether using wifi or 4/5G. 5G works but I have to go to the front of the house to find a signal - will only be an issue when my flaky (Virgin Media) wifi conks out.
Haven't done any battery testing but initial impressions are OK. Will need to use it for a few weeks before I can really tell. An hour long Facetime call, which would have killed my IP7, drained 15% of the battery. Wireless charging overnight using a cheap Anker Qi charger was silent and effective (with the Torras case on). I don't see the need for MagSafe.
I've been out for a bike ride using Strava and can report that the GPS seems more sensitive and accurate than on the IP7. Had an opportunity to test the camera out too. Again, this isn't a formal test, but I've loaded the images onto a 27 inch Mac and they are definitely crisper than similar photos taken with the IP7. I haven't tested the night mode functionality yet, or the LiDAR sensor (except to try the Measure App to see how tall my family are!).
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One little wrinkle, which has been picked up in the Press - the NHS Covid-19 App failed to work after transfer from the IP7. So I deleted it, then downloaded and set it up again. It's working again, but it's lost my previous data.
I haven't really tested out the additional benefits of the IP12 Pro over the IP12 yet, so all of these comments would apply equally to the IP12, which is also 25g lighter. But, overall, I'm really pleased with this upgrade so far.