I had that phone, more than one, actually. I loved so much about it. OLED screen with night mode, crazy durable design, and that camera amazed me more than once. It’s a shame Lumia died, and W10M was such a trash heap. I really loved WP 8.1.
Yeah, I think mine runs 8.1 and remains quite snappy. The maps still get occasional updates, too. They were definitely going for gold with the 1020.