This article by Alec Ramsay is published by Medium. Here is an excerpt:

How have apportionment and redistricting changed the congressional landscape? The new maps suggest a very small net gain for Democrats, but with re-apportionment still shy of even net proportional. Moreover, an approximate national balance obscures offsetting maps in a handful of states that are more unfair.

Details:

The table below compares the maps used in the 2020 elections with the new maps that will be used in November. Both sets of maps are compared using the same election composite which combines several statewide elections to remove the effects of individual candidates and campaigns. Hence, these comparisons isolate the impacts of the new apportionments and district boundaries.

Read the full article here.