I'm not saying that Touch ID fade doesn't exist but I haven't had it happen too me. I also have a launch day 5s. Accuracy is a different story , my iPhone wasn't always able to read my fingerprints and when it did normally it would cause strange glitches like audio skipping or repeating. 7.1 fixed that now it's accurate all of the time. If your Touch ID has a problem you should probably take it to Apple. As for the S5 anything copied from Apple is generally illy implemented.
Could you expand on what else is copied?.. for those of us new to the game..... After a quick glance the pull down notification menu looks strangely like the iPhone one, plus the bit where you can turn things on and off looks like command centre.. the swines.... Is there anything else..
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Samsung need a patent just to put a fingerprint sensor on a smartphone?
Who was the first one to do a fingerprint sensor on smartphone?
A quick Google search suggests that Motorola was the first in 2010.