First of all, casemaster is no longer manufactured. It was discontinued in late June. It was a very good window that Marvin had started manufacturing in the 90's with many changes and refinements until it's discontinuation.
The Ultimate casement is an entirely new window that was introduced about a year and a half ago. There are twenty different variations with features such as a 3 1/4" jamb replacement frame, 4 9/16" jamb with extensions for new construction, crank out, push out, French, venting picture etc.
Among other things, one of the most innovative features is the hardware. Whether it is the crank or the push out, the window can be manufactured up to a 40" x 92" or a 36" x 96" single casement with a "wash mode" that allows the sash with an easy release function to pivot 140 degrees to clean the outside of the glass from the interior.
It is high performance window tested to a Design Pressure 50 rating and most mulled windows are also certified.
My suggestion would be to go to a local showroom and view it for your self.I hope I answered your question. Good luck!