As barely anyone holds drop logs, there are no real results about drop rate. I've heard, for instance, dragon chainbody drop rate from 1:1000 till 1:20,000 at dusties. For visages I hear 1:1500 till 1:15,000 at iron and steel dragons. Abby whips can be anywhere within 1:100 and 1:1500. At these insane low drop rates, only results containing over 100k kills can be accurate. As no one is as insane as that to keep such a drop log, there are, indeed, no accurate drop rates. Also, as already has been noted, drop rates change from time to time so that added, it means it's just a lose on effort to ask for or collect drop rates :P