I have done intensive side-by-side comparison tests of Aviphot Pan 80 and ADOX HR-50. Result: The films are different, and the differences are significant.
HR-50 has better shadow detail and a significantly better characteristic curve (more linear and less S-shaped). HR-50 also offers visibly better results in reversal processing (BW transparencies): It can manage a wider contrast range (better 'dynamic range'). The ADOX HR-50 / Scala 50 transparencies (slides) are really outstanding. This film has become my most used BW reversal film meanwhile.
Best regards,
Henning