Difference between Qt4.8 and Qt5.0 when print pdf

Diference between pdf generation using Qt4.8 and Qt5.0.1, printing barcode 3 of 9 using basically same code.
The code

mm = 11.8;
QPrinter printer;
QStringList path = QStandardPaths::standardLocations(QStandardPaths::DocumentsLocation);
QString home = QFileInfo(path.at(0)).absoluteFilePath();

QDateTime fecha;
QString tarjFile = tr("tarjetas_%1.pdf").arg(fecha.currentMSecsSinceEpoch());
QString outputPdf = tr("%1/%2").arg(home).arg(tarjFile);

printer.setOutputFileName(outputPdf);
printer.setOutputFormat(QPrinter::PdfFormat);
printer.setPaperSize(QSize(85.6, 54), QPrinter::Millimeter);
printer.setResolution(300);
printer.setColorMode(QPrinter::Color);
printer.setPageMargins(0.0, 0.0, 0.0, 0.0, QPrinter::Millimeter);
printer.setFontEmbeddingEnabled(true);

QPainter painter;
painter.begin(&printer);
QFont fontC("3 of 9 Barcode", 16);

tarjeta = ("1234567890123456");
painter.drawText(QRect(0, 5*mm, 85.6*mm, 5*mm), Qt::AlignHCenter, tarjeta);
painter.end();

A picture with diference:

Barcode generated with Qt4.8; it works, with Qt5: it dosn't works (when I say "it works", is: the bardcode reader can read it and decode).

Barcode tested on LibreOffice, it works:

One of fonts tested: http://www.dafont.com/3of9-barcode.font

I tried with several fonts, using directly from windows's (xp) fonts and adding with QFontDatabase::addApplicationFont(). Same result.