Someone can correct me. But I thought I read with the latest firmware upgrade the focus now defaults to something like your P3P rather than having to manually focus. I'm sorry I don't know the terminology for that.
Having a
P4, what I notice different is the way it lands. It descends till about 2' off the ground, momentarily stops then continues to land. Its like a landing air brake. Caught me off guard the first couple times, thought it was a problem but apparently its normal. Just keep the left stick "down" till it lands.
Other than getting used to a different remote and memorizing where the buttons are, its very similar to the Phantoms.