  The lack of evidence for superparticles at the CERN LHC, along with the
rather high value of the Higgs mass, has sharpened the perception that
supersymmetric model parameter space is highly electroweak fine-tuned (EWFT).
We compare three measures of fine-tuning in SUSY models. 1. \Del_HS measures a
terms containing large log contributions to m_Z that are inevitable in models
defined at scales much higher than the electroweak scale. 2. \Del_BG measures
variation in m_Z against variation of model parameters and allows for
correlations among high scale parameters which are not included in \Del_HS. 3.
The model-independent \Del_EW measures how naturally a model can generate the
measured value of m_Z=91.2 GeV in terms of weak scale parameters alone. We
hypothesize an overarching Ultimate Theory (UTH) wherein the high scale soft
terms are all correlated. The UTH might be contained within the more general
effective SUSY theories popular in the literature. For \Del_HS, EWFT can be
overestimated by neglecting additional non-independent terms which lead to
large cancellations. For \Del_BG, EWFT can be overestimated by applying the
measure to the effective theories instead of to the UTH. The measure \Del_EW
allows for the possibility of parameter correlations which should be present in
the UTH and, since it is model-independent, provides the same value of EWFT for
the effective theories as should occur for the UTH. We find that the well-known
mSUGRA/CMSSM model is fine-tuned under all three measures so that it is
unlikely to contain the UTH. The non-universal Higgs model NUHM2 appears
fine-tuned with \Del_HS,BG > 10^3. But since \Del_EW can be as small as 7
(corresponding to 14% fine-tuning), it may contain the UTH for parameter ranges
which allow for low true EWFT.
