Fast answer: my best buds now completely blow away the supplied Apple earpods, the Apple airpods (wireless), I'd say the RHA-750i's (from your neck of the woods), other IEMs I own as well including the Zolo by Anker Liberty+. It's a completely different sound experience from my Sennheisers which are fantastic but clamp my head like a son of a female dog. I'm really liking the feel of better buds for lengthy listening, airiness, awareness of surroundings while out (I'm listening in the grocery store for example).
Longer answer:
First, I'm no expert. I've loved music forever and have invested in some good stuff over the years. My computer speakers are Paradigm Audio Studio 20's v.3 (Canadian: $1,500+) powered by an NAD VISO Five, so even in my office I have some pretty decent sound.
I've more recently purchased some middle of the road stuff as the bang for the buck with headphones is much more family budget friends....translated as Wife Acceptance Factor. I can fire off $200 orders for gear occasionally without any guilt.
I did some research and couldn't find a single thing detailing the power capability of the Samsung Note 8. Yes they maintained the audio jack and yes they have a hi-res DAC but nothing quoting the audiophile stats of the amplifier. That tells me it would be a fail. That seanc6441 knows what's in his LG also tells me that LG is making a case for better audio. He said it's rated to 600 ohm headphones?
There's a lot more science to it especially with mobile devices serving as source, DAC and amplifier. High impedance headphones will require more voltage than a phone may want to give out given battery management. Low impedance headphones will require more current than perhaps a phone may want to give. This is all part of the wizardry of battery management by the operating systems of Google/Samsung, Apple, etc. No phone company wants a review or user reporting back: my battery lasted 1 hour once I plugged in headphones and listened to a movie, or some music. The operating system of phones probably isn't drilled down to the level of knowing what someone is listening to in such a way as to manage voltages or current to give a better listening experience to the audiophiles in us. They're totally designed for the "average consumer" unless marketed to another: Samsung and Apple aren't really bragging about the built in amplifiers in their devices. Not yet anyways. They might brag about their DAC's a little bit.
As for sound. I haven't found the Sennheiser sound in any of the buds yet. There's a "roundness" or richness to the sound I feel in Sennheiser or that's how I would describe it. I'm sensitive to higher frequency sibilance also that I don't find in Senneiser. I'm really trying to get a feel for all of these buds I ordered and again will laud the performance of the emx500s. the Monk+ are not as capable.