SPACI score report for 2kfn in ASTRAL 1.67:

PDB Entry: 2kfn
SPACI score: 0.39
AEROSPACI score: 0.39

Experiment type: XRAY
Resolution: 2.03
R-factor: 0.214
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 2
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: -0.893
WCK2 WHAT_CHECK Ramachandran: -1.291
WCK3 WHAT_CHECK Chi angles: -1.012
WCK4 WHAT_CHECK Backbone: -5.246

Note: Here are links to pages about PROCHECK and WHAT_CHECK.

Here is the full WHAT_CHECK report on this protein (linked from the WHAT_CHECK site).