Hrmmm... Well in some aspects Sony does copy ideas, then on the other aspect, they copied and made better o.O; is that really a problem?
Sony "Copied" Rumble. Does anyone remember the rumblepack on the N64? Man talk about a piece of shit -_-;;; Thats certainly one feature they enhanced and standardized.
Hard drive attached to a console was started by Microsoft (as far as I know ) with the original xbox, now the 360 doesn't even have that as a standard feature, Sony "Copied" the idea and made it a permanent feature, hell, they even gave you the ability to change to a superior drive.
As mentioned earlier, Sony helped standardize disc formats for making games. CD, DVD, and now Blu-ray. And made it a pretty set standard of movie playback on consoles.
The guide button was on the PSP, and the PSP was in planning long before the xbox I'd say xD.
Sony may not always make the most original idea's, but I'll be damned if they don't enrich the environment, Gaming would certainly not be where it is today without Nintendo, but the exact same could be said of Sony.