OMG You are in the EXACT same predicament as me ! But I mean the s3 front camera wasn't the absolute best, but it was a little better than the s5 front facing camera. Ugh I too heard that the s5 had an AMAZING camera and quality. Somebody lied.
OMG YES. I JUST got the phone today and I noticed that the front facing camera is grainy and distorted a little and the regular camera is a bit blurry. How do I fix it ? I tried changing the display mode and the effects but it's still pretty much the same :/