Do go to Richard Binder com, it is the bible of nibs, filling systems and good advice on inks....it should take you at least three days to read through it.
No, I have a 1.5 Lamy on my Joy. I can write just normal, or try to draw Italic calligraphy as I will....if I practiced.
It is a nice rounded stub, not as sharp as CI or true italic.
Now a CI, cursive Italic is sharper and needs to fit where you hold the pen more. If ground for 45 degree hold and you normally hold at 40 there could be a tad of adjustment needed. You might need to hold it higher than you wish.
True Italic is sharp edged and must be held properly....and you should get a down load or a book on Italic calligraphy. You will get much more out of even you 1.1 Lamy nib, if you learn how to properly draw letters in calligraphy. There are many wonderful styles.
Don't listen to me....my book on my desk is rusted shut from the dust.
For normal writing there will be no problem....but you do have a nib to try some Italic calligraphy, so should take a look at learning to draw Fancy Letters.
Stiff Nib Italic is held differently than a normal fountain pen, it is held like a ball point before the big index knuckle and canted some 30-45 degrees, as you push pull the nib through the narrows and bellies of the fancy letter.
With everyone and his brother chasing superflex nibs for Copperplate and Spenserian, stiff nib Italic calligraphy gets mostly ignored here....out side of some times over Ink Reviews, where there is some who show marvelous italic scripts.