@Sarvo will know.
I've compared a 4-5k unit with an 8k unit, and the latter was clearly superior with better definiton. Animals and features were more pronounced.
Whether that extra bit of performance matters, probably comes down to how efficient you want to be. But if efficiency isn't the be-all-end-all, why go for a thermal device in the first place? Unless you've just got cash to burn, it's a lot of $$ to spend on a piece of gear that will be outdated in a year or two as new models come onto the market.
How good are your binos? Apologies if you're already sorted in this area, but on the off-chance that you're not, $3-5k of thermal money could do wonders in the bino department, and they'll last a lifetime.
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