There's a bit of back and forth between whether people consider IPX5 waterproof or not. Personally I think the layman expects waterproof to mean you can drop it in the bath and it won't get damaged. That occupies somewhere between IPX6 and IPX7 which is why it's a bit fuzzy
I'd counter that if you get water inside an IP68, it's screwed. (My Xperia got some moisture under the screen during a long bike tour through the rain, and it never really came back out.)
Water seeping inside an IP55 because you drop it in the bath, sink, toilet, hurricane, etc? Turn the thing off right away, remove battery, get it in a box with desiccant, and it'll probably be fine in a day. If not? Still repairable.
There's a few issues with your statement. IPX1-6 are actually grouped separately to 7-8. Complying with 7-8 submersion doesn't mean that it complies with 1-6.
So IPX8 states that the device can be submersed, but makes no statement about spray/droplets. If you comply to both, then they're both stated, eg "IPx5/IPx8"
The same applies to your IPX5 statement, defined as resistant to spray but not submersible. It makes no guarantee about what could happen if you drop it in water
And finally, even the drip tests only test for 10 minutes. Anything longer than 10 minutes is not guaranteed by IPX1-5
Right. The Xperia is IP65/68. I just glossed over this because I figure most people are unaware of that nuance. It's a pretty well sealed phone, because once the condensation gets in, it does not get back out without cracking the weather seal.
If the FP5 were just a tad smaller with a telephoto (like the Xperia) I'd be all over it---water resistant or not.
For me the main concern is it not breaking if it's in my pocket while I'm out in the rain - that was a failure mode for my FP1 and has not been great for my FP2, I think.
