It looks like you may have anti-aliasing on in 2.6 when pulling these images. 
We’ve seen these issues with WMS tiles coming back.

http://docs.geoserver.org/stable/en/user/webadmin/services/WMS.html#svg-options

__________________________     (╯°□°)╯︵ ┻━┻
 Ivan Suftin - Applications Developer - [email protected]
 Office: (608) 821-3825  - Cell : (608) 345-8963
 Center for Integrated Data Analytics - http://cida.usgs.gov/
 United States Geological Survey 
 8505 Research Way, Middleton, WI 53562 

On Nov 18, 2014, at 2:55 AM, Jonas Holmberg <[email protected]> wrote:

> Hi all, 
> 
> We are currently upgrading Geoserver from version 2.1 to 2.6, we have 
> encountered problems with image quality. 
> Version 2.1 uses Oracle JDK 6 and version 2.6 uses OpenJDK 7. Both versions 
> have native JAI and ImageIO installed. 
> 
> If you compare the images from version 2.1 and version 2.6 you can clearly 
> see that version 2.1 provides a much sharper image. 
> 
> 
> <Mail Attachment.gif>                                <Mail Attachment.gif> 
> Geoserver version 2.1 GetLegendGraphic request (png).                
> Geoserver version 2.6  GetLegendGraphic request (png).         
> 
> The legend is in swedish from our quaternary deposits wms. 
> 
> I would appreciate some help on how to solve this. 
> 
> Regards, 
> 
> Jonas Holmberg 
> Geological Survey of Sweden 
> 
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