From 9to5 Mac:

First observed by the Twitter user Ice universe, the Geekbench test was performed on an iPad Air 4 running iOS 14.0.1. The Geekbench score reports 1583 for single-core and 4198 for multi-core, compared to 1112 for single-core and 2832 for multi-core of the A12 Bionic chip that powers the previous iPad Air 3.

That means the A14 chip has 42% better perfomance than the A12 chip in single-core and 48% better in multi-core — which can be considered a great improvement for those upgrading from an iPad Air 3. Compared to the iPhone 11’s A13 Bionic chip, the A14 chip is about 20% faster in single-core (1327) and 28% faster in multi-core (3286).

The 20% single-core and 28% multi-core improvement is nothing to complain about -vs- the iPhone 11’s A13.