Fuzzy text on OS X with QGraphicsView and QOpenGLWidget viewport

With QT 5.4.0 it is no longer possible to set an OpenGL Widget as viewport of QGraphicsView and receiving good results.
Text becomes very fuzzy when scaling GraphicsItems. Thin Lines are no longer fully visible.
This effect also takes place with Qt Quick (see QTBUG-42861).
This is a Mac OSX only issue. On Windows everything looks good.

It seems that with Qt 5.4.0 rendering OpenGL Content has changed.
There is no difference using QOpenGLWidget or QGLWidget.

I've attached an example Project where the differences can be seen.
When compiling it with Qt 5.3.2 everything looks good.