Question : Problem: Z80 transistors

How many transistors has a Z80A CPU?!

Answer : Problem: Z80 transistors

The 8086 is about 2X the complexity of the Z80.  The gate count of 8000 for the Z80 is correct.  The 8086 has a gate count of about 18000.  How you arrive at transistors depends on how you count 'em.  I use a rule-of-thumb that the average transistor to gate count ratio for a microprocessor is 5-6:1.  Assuming your 8086 count of 29,000 transistors is accurate, that would place the transistor:gate ratio at less than 2:1.  Not likely for a uP like the 8086 which had virtually no internal cache.