This may have been asked before but what makes the 8L35 such a high grade movement that it is only seen in watches costing £2.5k+. I know it is an undecorated Grand Seiko movement so exclusivity plays a bit part in the price. However, compared to the likes of ETA and Sellita etc., is the 8L35 really that much better than for example ETA 2892 (which is seen as the top of the line offering from ETA) in quality? Is the price mainly determined by the fact that it is not available to other manufacturers for their own watches?

I'm curious as to whether the 8L35 is really that much better than what ETA/Sellita can produce. Is this just a case of that's where it's positioned by Seiko so that's why it costs that much rather than it being higher quality than ETA's/Sellita's offerings?