I still have my Lumia Icon (Windows platform) and it still out specs most smartphones. It was a solid phone, and I only switched back to Android because of the lack app support from Android and iOS developers.

With more developers starting to port their apps to the Windows platform, I'm considering going back to it.

Just as a comparison:

Display Pixel Density Lumia Icon: 441 Google Nexus 6 (new): 493

Camera Lumia Icon: 20MB Google Nexus 6 (new): 13MB

Processor: Lumia Icon: Quad core, 2200 MHz, Krait 400 Google Nexus 6 (new): Quad core, 2700 MHz, Krait 450

System Memory: Lumia Icon: 2048 MB RAM Google Nexus 6 (new): 3072 MB RAM

Keep in mind the Lumia was released in February 2014, The Nexus 6 was in November of 2015