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I ended up buying this one and jesus christ its comfortable. Its way bigger and heavier than my other sleeping bag but thats not suprising seeing how the Spark II is one of the smallest around.
I can actually sleep on the stomach with this one, feet in the footbox and the rest covering up my body.
Downside, its a 300€ blanket. Costs 215€ in the US but with taxes and shipping I would be at 300€ anyways.