Too early to think any measurement of Fielder will be a permanent one. The AL will be adjusting to Fielder's bat for months. Our best measuring stick will be watching Prince adjust to rival team adjustments.
Then we will find out just how good Prince's bat really is. I'm already impressed thou. I love the way he covers the entire field. For such a big-body, he's got quick reaction-time and a nice contact-eye for reading pitches.
We already know Prince has an elite bat.