1. at this resolution you can get closer, i.e. 2.5 - 3 m (guide size). The visual acuity also has an influence.
2. comparison image:
55SK8000 has:
2a. Edge LED and is not comparable to OLED. 55SK8500 has Full Array LED and is more comparable to OLED.
2b. alpha-7 processor.--> "worse" upscaler than OLED55C8 with alpha-9 processor.
3. comparison sound:
55SK8000 has 2.0 sound system (20 W). OLED55C8 has 2.2 sound system (40 W with subwoofer 20 W).
In my opinion, 55SK8000 is closer to OLED55B87.
The question is what differences are perceptible according to the data sheets in a comparative assessment; each buyer must judge this for himself.
There are automatic comparisons at Digitec and LG; these produce partly contradictory information. If one really wants to know, detailed data sheets must be compared manually.