Z3+ / Z4 to Z5.. is it wortth the jump

I currently own an Black unlocked Z3+ and Ive seen a Z5 (BNIB) in my local trade-in store.. if I was to purchase the Z5.. ide have to pay an extra £130 after my Z3+ trade in price...

When I buy a phone, I mainly go for Camera and Audio

Is the Z5 worth the money ill have to pay to upgrade..

Thanks.

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