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There are some significant differences between Preston Wilson and Johermyn Chavez just as there are significant differences between Chavez and Jermaine Dye.  Wilson's K rates were consistently between 24-27% in the minors, Chavez was at 29% his first year at low-A, 25% his second, and 21% this year at A+.  His walk rates improve the same way; 5.6% his first year at low-A, 7% his second, and 8.5% at A+, compared to Wilson who hovered around 4-5% until he learned to walk a bit at AAA somehow.  So Chavez is showing signs of improved contact and pitch recognition (especially when looking at his in season splits: 25.2 K%, 7.7 BB% Apr-Jun, then 18.1 K%, 9.7 BB% Jul-Sep). 
We also have to remember that Wilson came up at a very different time compared to players today, even though that time was less than 2 decades ago.  Back then, the mantra was much more, "See ball, hit ball, take a walk if you don't get a pitch to hit", as opposed to now where it's more, "Make him throw some pitches, hit it if you can crush it, don't offer at edgy stuff unless you don't have a choice."  Also, Wilson came from the US, whereas Chavez came from Venezuela.  Admittedly we've talked here about the poor coaching that exists here, but Chavez likely received absolutely no coaching, and likely had little experience using a real bat, until the Mariners signed him as a free agent.  In the end it might be an advantage (being trained only by the highest level professionals without the static of amateurs) but through his teenage years he was still learning a lot while playing against players that had been coached since childhood.
Therefore I think you have to try and compare Chavez against other players from outside the US (not Japan) to get a better comparison.  Unfortunately, a lot of the guys that pop up are Hall of Fame type talents (which not even the biggest Chavez fan is ready to label him) like Sosa, Andruw Jones, Vladimir Guerrero, and Miguel Cabrera, who mostly rocketed through the minors anyway.  So now it gets really difficult trying to match him up using my selection AND yours (a lot of players skip A+ or are rushed to it).  The best I can find are Nelson Cruz and Jose Bautista.  Both players entered the pros a lot later than Chavez (age 20 for Cruz and Bautista, age 17 for Chavez).  However, the similarities are nice, all 3 players are about the same size, all showed big time power in the minors and had bad strikeout totals (Cruz as bad or worse than Chavez, Bautista's not quite as bad).  Cruz walked less than Chavez, Bautista more.  The good news, as far as the comps go, is that both players are all stars, the bad news; it took both players a long time to get there (Cruz looked like a AAAA player until 27, Bautista admittedly had the weirdest lost year of development, but was an average roster filler type until this year).