I recently purchased the RX-A1050 and am very happy with it so far. I can't compare it to the Marantz directly but I can say the unit sounds great, has excellent processing, and I found the setup to be user friendly.
Originally, I purchased a Pioneer Elite receiver but ended up returning it for something more future proof. With ATMOS, DTS-X, HDCP 2.2 ect. the RX-A1050 fit the bill and I was able to snag one at a good price. The Yamaha YPAO did an excellent job in my room, very comparable to the advanced MCACC that the Pioneer was equipped with. The only weak side of the YPAO is that I don't believe it EQs down to 20Hz, it may stop short around 32Hz or so.
Overall, very satisfied with the receiver. I am currently running a 5.1.2 configuration and couldn't be happier with how it performs.