2GB on a phone does seem rather fast..and this is coming from the person whose phone only has 512 MB of RAM. :P
Yeah, 2 is pretty fast on a phone. Some have been rocking 3 as of late, like the aforementioned Oneplus and the LG G3. Not sure about the S5, but I'm pretty sure it does.
I don't remember you mentioning what phone you had. Which one are you rocking again?