Font rendering question wrt. Cardea and jdk 7

Following seeing http://bulenkov.com/2013/06/23/retina-support-in-oracle-jdk-1-7/ I thought I'd take a look at the latest EAP (130.1486 currently) and see how it did using the eap of jdk 1.7.0_40 (1.7.0_40-ea-b38).  Yes I know it's not a supported configuration but I'd like to know if what I saw was a jdk bug or an Intellij one so I can report it in the right place.  This is on OSX.

What I'm seeing is a quite different font rendering in JDK 7 - and one that I don't think looks so good.  JDK 6 renders it's fonts identcally to an OSX native app, attached are two pictures that show this.  JDK 7 sppears to render differently and noticably less clearly, there's a picture of this too.

Is this expected?  Did the Oracle JDK move over to a different font renderer when Apple stopped producing the JDK?  This would be rather sad if that's the case, I guess I'll get used to it but it's a shame to get rid of the colorspace bug in JDK 6 only to replace it with a font rendering one in JDK 7.

Thanks - Guy