Well, I have tested both. Results:
- HR-50 has significantly finer grain, higher resolution and better sharpness
- the characteristic curve of PanF+ is more linear, that of HR-50 more S-shaped
- the spectral sensitization is of course different (super-panchromatic vs. panchromatic).
Both films are excellent, and from both you can make very large prints from 35mm film with excellent quality. Especially with the modern, much improved high-performance lenses. These films with these lenses are a perfect combination.
But HR-50 has a very clear and visible advantage here: Enlargements from HR-50 35mm film often rival enlargements of classic emulsion films in medium format (4.5x6, 6x6).
You get a kind of 'medium-format-quality' with 35mm HR-50 / SCALA 50 concerning detail rendition.
And you get that quality at really very fair and attractive prices. ADOX has furtunately not followed KA's policy of very high price increases.
The price-performance ratio of HR-50 / SCALA 50 is really very outstanding.