My normal answer would be yes. For most games the Iris Pro and the 650m/750m will perform within a setting or two, making the experience (if not raw framerates) a wash.
For Company of Heroes 2 the answer shifts, as this is one of the most demanding graphics engines I can think of (or most poorly optimized). In this case, like with anything that has a highly developed graphics engine the Nvidia cards can pull away due to the focus of their architectures. Look into the respective framerates of the game on each system, and ask yourself if you find that acceptable. Remember that for an RTS an 'average' framerate isn't as useful as the minimum, as large fight scenes are when you need performance the most, and the capacity of the card to deliver in those situations should at least be considered.
Hope this helps.