I know this is a frequent topic, but is WTP really worth it, I am coming from SAN to LHR (747 old version) and from LHR to TLV (787).

How does the overall service and comfort differ from WT? What is the noticeable difference?

Is the food service pretty much the same or are there any other perks?

Early boarding compared to WT?

Another off topic question, is Avios awarded only after the flight is complete?

Thanks so much for the insight!