Curved bolster is so much more comfortable in my hand.  Also love that the I can sharpen the entire blade because the bolster does not interfere with the blade.
The Zwilling special formula steel is stain resistant and stays nice and sharp.  Also easy to hone and re sharpen.  The blade glides through meats and poultry, and I love the paper thin ham and roast beef slices I am able to achieve using the Pro.  Highly recommended.