Windows / Qt4.8: Text is scaled even worldmatrix and viewtransform are disabled

#include <QApplication>
#include <QGraphicsView>

class View : public QGraphicsView
{
public:
View() : QGraphicsView() {
QGraphicsScene *scene = new QGraphicsScene(this);
setScene(scene);
scale(0.02,0.02);
scene->setSceneRect(0,0, 10000, 8000);
}
void drawBackground(QPainter * p, const QRectF&) {

p->setWorldMatrixEnabled(false);
p->setViewTransformEnabled(false);
QFont f("Arial");
f.setPixelSize(64);
p->setFont(f);
p->drawText(QPoint(10,100),"Hello");
p->setWorldMatrixEnabled(true);
p->setViewTransformEnabled(true);
}
};

int main(int argc, char** argv)
{
QApplication app(argc,argv);
View *v = new View();
v->show();
app.exec();
return 0;
}