  We present an analysis of a sample of Seyfert 1 galaxies observed with
Suzaku. The aim of this work is to examine critically the evidence for a
relativistic Fe K alpha line in the X-ray spectra of these AGN. The sample was
compiled from those sources in which a relativistic component was missing in at
least one XMM-Newton observation. We analysed the Suzaku spectra of these
objects in order to have more constraints on the high energy emission,
including the Compton reflection hump. The results show that the relativistic
Fe K alpha line is detected (at >95% confidence) in all sources observed with
high signal-to-noise ratio (e.g. where the counts in the 5-7 keV energy band
are > 4 x 10^4). This is in agreement with the idea that relativistic lines are
a ubiquitous feature in the spectra of Seyfert galaxies, but are often
difficult to detect without very high quality data. We also investigate the
relation between the Fe K alpha line and the reflection continuum at high
energies. For most of the sample, the strength of the reflection component is
consistent with that of the line. There are exceptions in both senses, however
i.e. where the reflection continuum is strong but with weak line emission, and
vice versa. These observations present a challenge for standard reflection
models.
