But I want to see Realtor.com vs Zillow numbers (vs MLSListings vs Redfin vs the others...). It's not like any of these are ground truth. How much are the discr

But I want to see Realtor.com vs Zillow numbers (vs MLSListings vs Redfin vs the others...). It's not like any of these are ground truth. How much are the discrepancies, where are they and why? Also, is zipcode the lowest level of granularity (presumably not)? Do any of these services have finer granularity?