Using the dT(CO2) as a reference compared to the ERSSTv3b Northern Hemisphere SST a "sensitivity" of 1.23 C per doubling produces a zero mean for the residual.
With the land data there is another issue related to what exactly does Tave mean. To use the BEST and CET data for bridge to paleo reconstructions I removed part of the "land" amplification by scaling the data to a common 1955-2011/12 baseline. People relying on the "land" for a higher climate sensitivity will not like that. So let's look at BEST Tmax versus Tmin.
Smaller chart below replaced with above due to spreadsheet error.
For the higher sensitivity fans. Note: the background Tmin is inverted in the following chart - corrected below.
So when comparing Instrumental period data to climate "sensitivity" there is more to be considered.
Update: It took a while to beat OpenOffice into submission but this might be of interest to some of the Stadium Wave fans.