I earn less than a quarter of DH's high salary, due to going PT and taking additional unpaid Parental Leave in the holidays. We each have our salaries paid into our own accounts and then transfer some into central account, DH putting most in, and my contribution being small. As we have greater income than expenses, we both then find the most tax efficient way to deal with the rest. We both have multiple savings, ISA stocks and shares on the side (all individual), but when DH has used his allowance he puts it into mine.
I like to keep my own account so he can't see everything I buy, presents etc. I buy from the joint current, joint credit card (cash back one so worth using), or own credit card depending on what it is and what card I have on me. Children's clothes, household expenses all come from the joint, and sometimes my own stuff too. In the summer I only got half my part-time pay due to parental leave, so he transferred his bonus into my own current account so I still had my 'private' money.
Any large single item expenditure over maybe £200 we casually discuss, and agree. I think we consider the money as 'ours'. Our tastes and needs are similar.
Only difference is on the sum he has inherited, which just sits there. I can't access the accounts (not in UK). We discuss together what to do with it, but haven't got round to doing anything. He feels he should have the final say on this money as it's 'his' family's.
If money was tight I think we'd sort it out a bit more clearly, but as it is, neither of us has really expensive tastes, and so it doesn't come up.