best BMW for ride comfort?

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So I've had my M4 since launch back in 2014, and had a 640d before that. The 6 series had comfort seats and the M4's seats have quite a few adjustments but long journeys in both would give me backache, I've concluded that obviously my back isn't in great shape, but when driving the missus' Merc C250 I'm absolutely fine. I was wondering what people make of the ride comfort / seating position in higher vehicles like the X5? I'm thinking that getting one of these would make an improvement, but a friend was saying something in the exec class like a 7-series has superior ride comfort to the X5 type SUV cars. Anyone with experience of all of these?

[cringle]

Thanks for the thoughts peeps. Will try adjusting seat base as i indeed have it low and with front part raised up! Wannabe touring car driver position

[cringle]

Thanks for the thoughts peeps. Will try adjusting seat base as i indeed have it low and with front part raised up! Wannabe touring car driver position