The first semi-finalists(England v South Africa, at Bristol) and Bristol has the best condition for batters in this World Cup.
In 7 games 3329 Runs(Avg 36.58) have been scored losing only 91 wickets @4.94 R/O (highest run rate). The scoring rate is the highest as well @ 42.47/100 balls, and from 13 centuries, 6 were scored at Bristol.
Here is a how stats table of each venue in this World Cup.
List of winners in previous World Cup
All data is updated before the semi-finals