sorry to say this, but it means NOTHING.
As many people have said many times before on this forum, at PhD level, the university is less important than for your Masters or UG degree. Although it is a success to be a PhD student at Oxford, that fact in itself will not give you a ticket to success. There are other factors, for example your age, your previous qualifications, the type of job you intend to work at etc.
And of course your attitude toward christian courtship..