I can only speak to compare it to the Nexus 5 I had, but it is better than that in my completely unscientific test of using my phone around my house. My Nexus 5 struggled for signal in my basement; however, my S6 can maintain between 2-3 bars down there which is enough for me to make phone calls and do text messaging. I have noticed better signal as I have traveled to client sites as well over the last week.
Sorry, I can't speak to the other devices you mention.
No - that sounds really good, thank you.
I have a European unlocked Note 3 and been on that forum for a year.
I love the phone, but the general consensus there was the connections were weak. Signal and public wifi is pretty poor.
GPS has been good for 6 months. I tried other carrier sims, and I have a Moto G LTE to compare.
The Note 4 is an improvement apparently (I don't know anyone with one).
It must be the newer chipsets as well.
I hope more will agree with you.