On Fri, 8 Jun 2012, Jörg Weber wrote:

> Some further testing showed that the simple document with palatino 
> compares fine, but with dejavu it is not comparable. With XeLaTeX, 
> setting palatino as the main font, still does not work.

ConTeXt uses TeX Gyre Pagella rather than true Palatino. That might be a 
source of difference.

Aditya