First jet encounter was by a Mosquito, I heard. And the first one downed was by a P-47, the first kills by -262s were F-5 Recce Lightning and two PR. Mosquitos...this is what I heard, feel free to correct it if it's wrong.
I'm not aware of any encounters between a P-38 and a Me-262 (though I have flown some simulated encounters). The P-38 was credited with the first kill over a Me-163. But I believe by the time the 262 could be encountered with any regularity the P-38 was mostly relegated to shooting up the Wermacht and note escorting heavies.
The topic that everyone accepts the Il-2M was the best Tank Killer aircraft of the war in ability but personal preferances swing to the Ju-87G in some?
a couple of things. SG 1 and 3 and 77 during 43-45 do not have written histories so we will never know right at present was their 10th Panzerstafflen actually shot up.
neither a concise history as far as I am aware of all Il-2 units. in any case the Il-2 did cause havoc as experienced by a good friend of mine, now deceased but it did no damage to the Stugs of the Stug Abteilung 1 under his own admission. It appears like many so-called tank busters the Il-2 and Tiffy did cause many MT casualties but did not in effect destroy armor in the "claimed" amounts.....