LHO opens 1♦, partner overcalls 1♠, RHO makes a negative X. Your call.
If you think xxxx x AJxx KTxx was worth a 4♠ bid opp a 3rd seat 1♠ bid, you no doubt think this is worth bidding game as well, although this is MP and both opponents are bidding, but do those considerations matter to the adherents of that school of thought ? You're playing 3♦ to show a mixed raise and 4♣ would be fit-showing.
Even if you think you're going to bid game eventually are there any tactical advantages in bidding a fit-showing 4♣ bid on the way so partner's in the picture or do you simply bid 4♠ to force opponents to guess before they have had a chance to define their hands at all ? Given the colors, opponents will be inclined to double you readily if you press them too hard. Any considerations about 4♣ being lead-directing against an enemy 5-level contract ?

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