After 6 pages, you still want more?
I remember reading posts from someone who had both but there are 375 pages to search, unfortunately.
Owners Thread for MRX 540, 740 & 1140 Receivers | AVS Forum
I think I have expressed enough opinion of my own, but could add one more, that is, if your want to minimize bug issues, ARCG performance and the lack of independent subwoofer outputs, forget both and stick with the big names such as Onkyo, Denon, and Marantz.
The Integra DRX-8.4 and the AVR-X4800H would be my choice if you cannot wait, otherwise wait till Christmas or early next year as by that time, Denon would likely revert back to using AKM, or a better ESS DAC IC for the prepro section, though the difference would not be audible to 99% of the population, but Dirac Live will make a difference especially if you believe in RC/EQ full range.
If you are fixated on the MRX-740 vs MRX-1140, then I would just repeat,
the dividing line is mainly, if not only, the independent sub outs. The 740 offers two, but they are not independent like the 1140's are. That means, if you only use one sub, there is no reason to pay more for the 1140.