Multiple issues in drawing canvas items on QPrinter with PdfFormat on Windows

While drawing canvas items, there are multiple issues when printing PDF on windows. It used to work fine in Qt 4.8. Following are the observed issues. Although printing is working fine on screen.

1. Transparency/Opacity doesn't take effect in lines/poly-lines etc when pen width is high (say 20).
2. Antialiasing is not working when drawing Filled Ellipse or Rectangle with high width pen.
3. Pen width of Ellipse is chopped off from top, bottom, left & right, when pen width is high.

A small test program and it's output PDF file is attached along with screenshot of expected output (generated with similar code).