History
Even before Michael Jackson died, fans of other (highly-talented) musicians have used him as a standard of comparison. There may be a select few that can actually compare to MJ, but who, and why?
In terms of writing music alone, it's possible to say, perhaps, Quincy Jones or Stevie Wonder compare (Quincy may be better). We could go as far as contrasting MJ to classical composers, who were pioneers in their own respect. Although their music theory may be more skilled or complex, they're incomparable, and to add, MJ could easily follow their talent by ear. Otherwise, I can't think of any MODERN artist who truly outshines or even compares to Michael.
Ability
Music is the core of MJ's productions, but not the only aspect. Michael Jackson was also esteemed for his amazing dance ability, his mind-blowing videos and his ongoing inspiration. So, in order to compare anyone to MJ, you have to know what he does:
Michael's talent:
Singer (yes, the voice is an instrument, see below)
Songwriter
Lyricist
Dancer/Choreographer
Producer
Arranger/Composer
Performer
Instrumentalist (vocals/beatbox, piano, guitar, drums, keyboard)
Director
Actor
Before there are any comparisons, we first have to consider this: what did Michael Jackson do himself? Yes, at times he did cover and perform songs that others wrote, but that does not discredit him as an artist; he was simply working with others. However, here's a list of songs written by Michael Jackson.
Comparison
List of people compared to Mike (by media or society):
Beethoven (might be better @ composition but he was only a composer)
Stevie Wonder (fair)
Prince (lol)
The Beatles (nah)
Elvis (lmao)
Justin Timberlake (rofl)
Lady Gaga (WTF)
Chris Brown, pre-domestic violence (R U kidding?)
Justin Bieber (heads will roll)
The most common comparisons are MJ vs Elvis Presley and MJ vs Prince Rogers Nelson, known as "Prince" or the androgynous symbol "O(+>"
MJ > Prince > Elvis. MJ > Elvis is self-explanatory (owned the man AND married his daughter), but MJ > Prince, though commonly known, involves a bit of knowledge. I could get to the gritty right now, however, a few sources will suffice:
Interesting links
Why MJ is really, really Bad
A BIG boo-boo on Prince's part!
Point: maybe someday, but right now, no one touches MJ.