Maltawildplants.com is now considered an online flora of the Maltese islands, portraying more than 900 species of plants found in Maltese habitats. It harbours a forum created in 2005 were memberes discuss topics about the Maltese flora and ID of plants.
There is also I. germanica s.l. which resembles it a bit, but this is usually darker in colour. The leaves of I. sicula are pale green and slightly glaucous, those of Germanica (usually) darker, but I have not seen many I. germanica to be sure about this observation.
I'm afraid I am not knowledgable enought to tell the difference.
I could tell you exactly where I found them ( there was a group of about 6 or 7) and you can check them out yourself.
In general I think the photos are I. sicula. In the first photo I can see the flowering stem turning glaucous towards the base and the flower is relatively pale. I just wanted to inform you about the existence of the closely related I. germanica and so not every large branching Iris is I. sicula.