Yes, no other country is 'investing' in Pakistan, if by investment we mean Chinese-style 'investment,' which are loans locked with sovereign guarantees and terms to use only Chinese suppliers.
However, Turkiye is doing what we call offsets, i.e., when selling facilities to WIL, it's re-importing the goods from WIL so that WIL can recoup its costs. Yes, Turkiye also footed loans for two Pakistani defence programs from its own fiscal exchequer, and then on top of that, offered to invest (i.e., as an acutal investor, not a loan shark) in a regional MRO and training centre for its systems in Pakistan so that, again, whatever outflows from Pak would come back as investment and sales into Pak.
Just give me 1 dude.