Welcome aboard!!
You will be glad you got the X5, as the X3 is the same thing as the P4 has.
I started with an X3 and quickly outgrew it. (Took about 2 days!!) If I had it to do over again, I would have skipped the X3 entirely!!
Olympus are the best. I have 4 of them. 12mm, 17mm, 25mm and 45mm. The 12mm is the widest and perhaps most photographer's favorite, but since I got the 17mm, I am leaning toward it as my go to lens. It is $200 less than the 12mm, is all metal construction, opens a bit larger, (F1.8 vs F2.0), and I think it gets a bit better detail than the 12mm. It does need a 33gm. balance ring though. Available through DJI or Adorama. (The 12 balances with just a UV or other filter)