big thing is, is, that nokia/microsofts "unflagship" is much better than samesongs highly touted flagship note. I have the 1020 and a note running kitkat. The note is slow, laggy and the OS is just jumping all over the place. My nokia 1020 is technically "inferior" to my note phone, however its buttery smooth, fast and the camera is approximately 10000000000 times better. I have yet to take a good photo with the notes camera. The only reason im using the note is I dropped my nokia and shattered the screen. Every day tasks that I do on my 1020, are a chore on the note because of lag, and poor overall performance from the Android ecosystem. Its poor, at best. I can guarantee that the 1520 while "technically inferior" and does not meet your definition of flagship, is a much better phone, tablet, device than the note will ever be. I would look at overall experience than the hard specs. The samesong needs 8 cores etc in order to make android remotely run smooth. The 1520 does not need a powerful processor to run WINPHONE. Then, look at camera performance, (or lack there of in Samsung), Another useful feature unlike having the fastest processor when not needed. Look at sound quality both from the external speaker and the headphone jack. Again, Lumia rules the roost here. Then, look at battery life. I can go all day and then some with my Lumia. My note needs to be plugged in by early afternoon. Lumia wins again. Hell, this one is not even looked at any more. Call quality. The call quality and signal reception of the Lumia is vastly superior than the note as well.
See, specs don't tell the story. User experience does. yes, android gets more apps, but I have every major app on my Lumia and they run great and provide a great user experience. I could care less about specs, A flagship phone should provide the best USER EXPERIENCE regardless of specs.