Filter vs. query seems to work differently. For instance:
A query when filtered with CPC H02K1 gives 823 results, while an unfiltered query with AND cl = "H02K1" is added returns 1224 items.
This seems odd or wrong or it's just me...

I am new to Espacenet and I wonder compared to Google Patents, is there more documents in Espacenet?
The espacenet search user interface seems much better.
Any hints would be appreciated.