All studies over many decades concur.
You can view the studies at:
calcSD - Dataset List
Yes, there are minor variations. It doesn't amount to much. The average caucasian, black, hispanic, and asian, guy are all about the same size.
The entire reason you think what you do about asians is for the same ridiculous reason people think what they do about black guys: porn culture.
The adult industry has sought out black men perpetuating a BBC myth. Just like even the average man (totally uneducated about the reality of penis size) thinks that he is "small" or "inadequate" b/c all porn stars have monster dicks. #1 That isn't even true as it's various tricks, body sizes, small women/hands, angles, etc... #2 The ones who are truly large are not nearly as large as they claim (mostly due to the former issue #1).
It has become so bad even that black men who are average sized likely don't even take their pants or underwear down in front of men in lockers b/c they don't possess this mythical 'BBC'. Talk about a fuck job to millions of guys mentality right?
Additionally that whole thing likely got started out of a racist issue. It was to equate them with an "animal", a "black BULL", etc... Essentially dehumanizing them in a racist effort. Sad. Very sad. Porn has now changed that landscape and our modern culture as well. It's really bad for the black men that are like most other caucasian and asian men: roughly average within 1 standard deviation +/-.
The bottom line is that all races are roughly around 5.5in EL by 4.55in EG within +/- .5in. That grouping with about 1 standard deviation covers easily 90%+ of all racial groups and men. Period.